256927222987 has 4 divisors (see below), whose sum is σ = 256928335000. Its totient is φ = 256926110976.

The previous prime is 256927222967. The next prime is 256927223017. The reversal of 256927222987 is 789222729652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 256927222987 - 2⁷ = 256927222859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256927222967) 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, 64758 + ... + 719755.

It is an arithmetic number, because the mean of its divisors is an integer number (64232083750).

Almost surely, 2^256927222987 is an apocalyptic number.

256927222987 is a deficient number, since it is larger than the sum of its proper divisors (1112013).

256927222987 is an equidigital number, since it uses as much as digits as its factorization.

256927222987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112012.

The product of its digits is 30481920, while the sum is 61.

The spelling of 256927222987 in words is "two hundred fifty-six billion, nine hundred twenty-seven million, two hundred twenty-two thousand, nine hundred eighty-seven".