256507720650260 has 12 divisors (see below), whose sum is σ = 538666213365588. Its totient is φ = 102603088260096.

The previous prime is 256507720650253. The next prime is 256507720650277. The reversal of 256507720650260 is 62056027705652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 73799404872964 + 182708315777296 = 8590658^2 + 13516964^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6412693016237 + ... + 6412693016276.

It is an arithmetic number, because the mean of its divisors is an integer number (44888851113799).

Almost surely, 2^{256507720650260} is an apocalyptic number.

256507720650260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256507720650260 is an abundant number, since it is smaller than the sum of its proper divisors (282158492715328).

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

256507720650260 is a wasteful number, since it uses less digits than its factorization.

256507720650260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12825386032522 (or 12825386032520 counting only the distinct ones).

The product of its (nonzero) digits is 10584000, while the sum is 53.

The spelling of 256507720650260 in words is "two hundred fifty-six trillion, five hundred seven billion, seven hundred twenty million, six hundred fifty thousand, two hundred sixty".