256285557830 has 16 divisors (see below), whose sum is σ = 485593688880. Its totient is φ = 97118737632.

The previous prime is 256285557761. The next prime is 256285557859. The reversal of 256285557830 is 38755582652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674435489 + ... + 674435868.

It is an arithmetic number, because the mean of its divisors is an integer number (30349605555).

Almost surely, 2^256285557830 is an apocalyptic number.

256285557830 is a deficient number, since it is larger than the sum of its proper divisors (229308131050).

256285557830 is a wasteful number, since it uses less digits than its factorization.

256285557830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348871383.

The product of its (nonzero) digits is 20160000, while the sum is 56.

The spelling of 256285557830 in words is "two hundred fifty-six billion, two hundred eighty-five million, five hundred fifty-seven thousand, eight hundred thirty".