256956477 has 4 divisors (see below), whose sum is σ = 342608640. Its totient is φ = 171304316.

The previous prime is 256956467. The next prime is 256956499. The reversal of 256956477 is 774659652.

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 a cyclic number.

It is not a de Polignac number, because 256956477 - 2¹⁰ = 256955453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256956407) 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, 42826077 + ... + 42826082.

It is an arithmetic number, because the mean of its divisors is an integer number (85652160).

Almost surely, 2^256956477 is an apocalyptic number.

It is an amenable number.

256956477 is a deficient number, since it is larger than the sum of its proper divisors (85652163).

256956477 is an equidigital number, since it uses as much as digits as its factorization.

256956477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85652162.

The product of its digits is 3175200, while the sum is 51.

The square root of 256956477 is about 16029.8620393315. The cubic root of 256956477 is about 635.7502257796.

The spelling of 256956477 in words is "two hundred fifty-six million, nine hundred fifty-six thousand, four hundred seventy-seven".