256890543977 has 4 divisors (see below), whose sum is σ = 256909604736. Its totient is φ = 256871483220.

The previous prime is 256890543967. The next prime is 256890543979. The reversal of 256890543977 is 779345098652.

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 256890543977 - 2¹⁶ = 256890478441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256890543979) 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, 9510149 + ... + 9537122.

It is an arithmetic number, because the mean of its divisors is an integer number (64227401184).

Almost surely, 2^256890543977 is an apocalyptic number.

It is an amenable number.

256890543977 is a deficient number, since it is larger than the sum of its proper divisors (19060759).

256890543977 is a wasteful number, since it uses less digits than its factorization.

256890543977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19060758.

The product of its (nonzero) digits is 114307200, while the sum is 65.

The spelling of 256890543977 in words is "two hundred fifty-six billion, eight hundred ninety million, five hundred forty-three thousand, nine hundred seventy-seven".