1256116615520 has 48 divisors (see below), whose sum is σ = 3195850548240. Its totient is φ = 463796903424.

The previous prime is 1256116615519. The next prime is 1256116615547. The reversal of 1256116615520 is 255166116521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301949030 + ... + 301953189.

It is an arithmetic number, because the mean of its divisors is an integer number (66580219755).

Almost surely, 2^{1256116615520} is an apocalyptic number.

1256116615520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256116615520 is an abundant number, since it is smaller than the sum of its proper divisors (1939733932720).

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

1256116615520 is a wasteful number, since it uses less digits than its factorization.

1256116615520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603902247 (or 603902239 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 1256116615520 in words is "one trillion, two hundred fifty-six billion, one hundred sixteen million, six hundred fifteen thousand, five hundred twenty".