256616501 has 4 divisors (see below), whose sum is σ = 256713600. Its totient is φ = 256519404.

The previous prime is 256616483. The next prime is 256616519. The reversal of 256616501 is 105616652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (256616483) and next prime (256616519).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256616501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256616531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44471 + ... + 49908.

It is an arithmetic number, because the mean of its divisors is an integer number (64178400).

Almost surely, 2^256616501 is an apocalyptic number.

It is an amenable number.

256616501 is a deficient number, since it is larger than the sum of its proper divisors (97099).

256616501 is an equidigital number, since it uses as much as digits as its factorization.

256616501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97098.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 256616501 is about 16019.2540712731. The cubic root of 256616501 is about 635.4697175584.

The spelling of 256616501 in words is "two hundred fifty-six million, six hundred sixteen thousand, five hundred one".