256620660023 has 96 divisors (see below), whose sum is σ = 341161777152. Its totient is φ = 190935360000.

The previous prime is 256620660019. The next prime is 256620660071. The reversal of 256620660023 is 320066026652.

It is a happy number.

It is not a de Polignac number, because 256620660023 - 2² = 256620660019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256620660073) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 341704898 + ... + 341705648.

It is an arithmetic number, because the mean of its divisors is an integer number (3553768512).

Almost surely, 2^256620660023 is an apocalyptic number.

256620660023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

256620660023 is a deficient number, since it is larger than the sum of its proper divisors (84541117129).

256620660023 is a wasteful number, since it uses less digits than its factorization.

256620660023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

Adding to 256620660023 its reverse (320066026652), we get a palindrome (576686686675).

The spelling of 256620660023 in words is "two hundred fifty-six billion, six hundred twenty million, six hundred sixty thousand, twenty-three".