256451616051 has 4 divisors (see below), whose sum is σ = 341935488072. Its totient is φ = 170967744032.

The previous prime is 256451616013. The next prime is 256451616073. The reversal of 256451616051 is 150616154652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256451616051 - 2⁷ = 256451615923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256451615994 and 256451616012.

It is not an unprimeable number, because it can be changed into a prime (256451616151) 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 3 ways as a sum of consecutive naturals, for example, 42741936006 + ... + 42741936011.

It is an arithmetic number, because the mean of its divisors is an integer number (85483872018).

Almost surely, 2^256451616051 is an apocalyptic number.

256451616051 is a deficient number, since it is larger than the sum of its proper divisors (85483872021).

256451616051 is an equidigital number, since it uses as much as digits as its factorization.

256451616051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85483872020.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 256451616051 in words is "two hundred fifty-six billion, four hundred fifty-one million, six hundred sixteen thousand, fifty-one".