256255782658 has 64 divisors (see below), whose sum is σ = 403710607872. Its totient is φ = 121893932160.

The previous prime is 256255782611. The next prime is 256255782677. The reversal of 256255782658 is 856287552652.

It is a super-2 number, since 2×256255782658² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256255782596 and 256255782605.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218834413 + ... + 218835583.

It is an arithmetic number, because the mean of its divisors is an integer number (6307978248).

Almost surely, 2^256255782658 is an apocalyptic number.

256255782658 is a deficient number, since it is larger than the sum of its proper divisors (147454825214).

256255782658 is a wasteful number, since it uses less digits than its factorization.

256255782658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679.

The product of its digits is 80640000, while the sum is 61.

The spelling of 256255782658 in words is "two hundred fifty-six billion, two hundred fifty-five million, seven hundred eighty-two thousand, six hundred fifty-eight".