15454881648 has 360 divisors, whose sum is σ = 48411106848. Its totient is φ = 4766750208.

The previous prime is 15454881623. The next prime is 15454881667. The reversal of 15454881648 is 84618845451.

15454881648 is a `hidden beast` number, since 1 + 54 + 548 + 8 + 1 + 6 + 48 = 666.

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 = 15454881594 and 15454881603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 89334490 + ... + 89334662.

Almost surely, 2^15454881648 is an apocalyptic number.

15454881648 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 15454881648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24205553424).

15454881648 is an abundant number, since it is smaller than the sum of its proper divisors (32956225200).

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

15454881648 is an equidigital number, since it uses as much as digits as its factorization.

15454881648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 238 counting only the distinct ones).

The product of its digits is 4915200, while the sum is 54.

It can be divided in two parts, 154548 and 81648, that added together give a square (236196 = 486²).

The spelling of 15454881648 in words is "fifteen billion, four hundred fifty-four million, eight hundred eighty-one thousand, six hundred forty-eight".