256966977 has 4 divisors (see below), whose sum is σ = 342622640. Its totient is φ = 171311316.

The previous prime is 256966939. The next prime is 256966979. The reversal of 256966977 is 779669652.

It is a happy number.

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 not a de Polignac number, because 256966977 - 2¹⁰ = 256965953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256966979) 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, 42827827 + ... + 42827832.

It is an arithmetic number, because the mean of its divisors is an integer number (85655660).

Almost surely, 2^256966977 is an apocalyptic number.

It is an amenable number.

256966977 is a deficient number, since it is larger than the sum of its proper divisors (85655663).

256966977 is an equidigital number, since it uses as much as digits as its factorization.

256966977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85655662.

The product of its digits is 8573040, while the sum is 57.

The square root of 256966977 is about 16030.1895497215. The cubic root of 256966977 is about 635.7588852052.

The spelling of 256966977 in words is "two hundred fifty-six million, nine hundred sixty-six thousand, nine hundred seventy-seven".