1256013107440 has 120 divisors (see below), whose sum is σ = 3658310853120. Its totient is φ = 397507428864.

The previous prime is 1256013107429. The next prime is 1256013107491. The reversal of 1256013107440 is 447013106521.

It is a super-2 number, since 2×1256013107440² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1256013107396 and 1256013107405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12272560 + ... + 12374479.

It is an arithmetic number, because the mean of its divisors is an integer number (30485923776).

Almost surely, 2^{1256013107440} is an apocalyptic number.

1256013107440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256013107440 is an abundant number, since it is smaller than the sum of its proper divisors (2402297745680).

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

1256013107440 is a wasteful number, since it uses less digits than its factorization.

1256013107440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24647079 (or 24647066 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 1256013107440 in words is "one trillion, two hundred fifty-six billion, thirteen million, one hundred seven thousand, four hundred forty".