1256700663240 has 64 divisors (see below), whose sum is σ = 4112838538560. Its totient is φ = 304654705920.

The previous prime is 1256700663227. The next prime is 1256700663289. The reversal of 1256700663240 is 423660076521.

It is a junction number, because it is equal to n+sod(n) for n = 1256700663192 and 1256700663201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476021659 + ... + 476024298.

It is an arithmetic number, because the mean of its divisors is an integer number (64263102165).

Almost surely, 2^{1256700663240} is an apocalyptic number.

1256700663240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256700663240 is an abundant number, since it is smaller than the sum of its proper divisors (2856137875320).

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

1256700663240 is a wasteful number, since it uses less digits than its factorization.

1256700663240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952045982 (or 952045978 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 1256700663240 in words is "one trillion, two hundred fifty-six billion, seven hundred million, six hundred sixty-three thousand, two hundred forty".