1281447551448 has 128 divisors (see below), whose sum is σ = 3662752665600. Its totient is φ = 414861523200.

The previous prime is 1281447551441. The next prime is 1281447551453. The reversal of 1281447551448 is 8441557441821.

1281447551448 is a `hidden beast` number, since 1 + 2 + 8 + 1 + 4 + 47 + 551 + 4 + 48 = 666.

It is a super-2 number, since 2×1281447551448² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1281447551394 and 1281447551403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281447551441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1650453 + ... + 2299323.

It is an arithmetic number, because the mean of its divisors is an integer number (28615255200).

Almost surely, 2^{1281447551448} is an apocalyptic number.

1281447551448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281447551448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1831376332800).

1281447551448 is an abundant number, since it is smaller than the sum of its proper divisors (2381305114152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281447551448 is a wasteful number, since it uses less digits than its factorization.

1281447551448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649150 (or 649140 counting only the distinct ones).

The product of its digits is 5734400, while the sum is 54.

The spelling of 1281447551448 in words is "one trillion, two hundred eighty-one billion, four hundred forty-seven million, five hundred fifty-one thousand, four hundred forty-eight".