256585982990 has 24 divisors (see below), whose sum is σ = 469550348280. Its totient is φ = 100951847520.

The previous prime is 256585982963. The next prime is 256585983011. The reversal of 256585982990 is 99289585652.

It is a happy number.

256585982990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 256585982990.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3410600 + ... + 3485019.

It is an arithmetic number, because the mean of its divisors is an integer number (19564597845).

Almost surely, 2^256585982990 is an apocalyptic number.

256585982990 is a deficient number, since it is larger than the sum of its proper divisors (212964365290).

256585982990 is an equidigital number, since it uses as much as digits as its factorization.

256585982990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895748 (or 6895687 counting only the distinct ones).

The product of its (nonzero) digits is 139968000, while the sum is 68.

The spelling of 256585982990 in words is "two hundred fifty-six billion, five hundred eighty-five million, nine hundred eighty-two thousand, nine hundred ninety".