256977930307 has 4 divisors (see below), whose sum is σ = 293689063216. Its totient is φ = 220266797400.

The previous prime is 256977930283. The next prime is 256977930323. The reversal of 256977930307 is 703039779652.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256977930307 is a prime.

It is a super-3 number, since 3×256977930307³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256977930397) 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, 18355566444 + ... + 18355566457.

It is an arithmetic number, because the mean of its divisors is an integer number (73422265804).

Almost surely, 2^256977930307 is an apocalyptic number.

256977930307 is a deficient number, since it is larger than the sum of its proper divisors (36711132909).

256977930307 is an equidigital number, since it uses as much as digits as its factorization.

256977930307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36711132908.

The product of its (nonzero) digits is 15002820, while the sum is 58.

The spelling of 256977930307 in words is "two hundred fifty-six billion, nine hundred seventy-seven million, nine hundred thirty thousand, three hundred seven".