256621653036562 has 32 divisors (see below), whose sum is σ = 442029109305600. Its totient is φ = 110506586533200.

The previous prime is 256621653036557. The next prime is 256621653036571. The reversal of 256621653036562 is 265630356126652.

It is a super-2 number, since 2×256621653036562² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256621653036497 and 256621653036506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168838989 + ... + 170352127.

It is an arithmetic number, because the mean of its divisors is an integer number (13813409665800).

Almost surely, 2^{256621653036562} is an apocalyptic number.

256621653036562 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

256621653036562 is a deficient number, since it is larger than the sum of its proper divisors (185407456269038).

256621653036562 is a wasteful number, since it uses less digits than its factorization.

256621653036562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918902.

The product of its (nonzero) digits is 69984000, while the sum is 58.

The spelling of 256621653036562 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, six hundred fifty-three million, thirty-six thousand, five hundred sixty-two".