256623313660599 has 16 divisors (see below), whose sum is σ = 352112027604480. Its totient is φ = 166163977649280.

The previous prime is 256623313660561. The next prime is 256623313660607. The reversal of 256623313660599 is 995066313326652.

It is a happy number.

It is not a de Polignac number, because 256623313660599 - 2¹⁵ = 256623313627831 is a prime.

It is a super-2 number, since 2×256623313660599² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256623313660699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6946636114 + ... + 6946673055.

It is an arithmetic number, because the mean of its divisors is an integer number (22007001725280).

Almost surely, 2^{256623313660599} is an apocalyptic number.

256623313660599 is a deficient number, since it is larger than the sum of its proper divisors (95488713943881).

256623313660599 is a wasteful number, since it uses less digits than its factorization.

256623313660599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13893309350.

The product of its (nonzero) digits is 283435200, while the sum is 66.

The spelling of 256623313660599 in words is "two hundred fifty-six trillion, six hundred twenty-three billion, three hundred thirteen million, six hundred sixty thousand, five hundred ninety-nine".