1249555403952 has 640 divisors, whose sum is σ = 4121556203520. Its totient is φ = 360233533440.

The previous prime is 1249555403893. The next prime is 1249555403981. The reversal of 1249555403952 is 2593045559421.

1249555403952 is a `hidden beast` number, since 1 + 2 + 4 + 9 + 5 + 5 + 540 + 3 + 95 + 2 = 666.

It is a super-2 number, since 2×1249555403952² (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 an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 463999918 + ... + 464002610.

It is an arithmetic number, because the mean of its divisors is an integer number (6439931568).

Almost surely, 2^{1249555403952} is an apocalyptic number.

1249555403952 is a gapful number since it is divisible by the number (12) 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 1249555403952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2060778101760).

1249555403952 is an abundant number, since it is smaller than the sum of its proper divisors (2872000799568).

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

1249555403952 is a wasteful number, since it uses less digits than its factorization.

1249555403952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858 (or 2846 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 54.

The spelling of 1249555403952 in words is "one trillion, two hundred forty-nine billion, five hundred fifty-five million, four hundred three thousand, nine hundred fifty-two".