256684166990 has 16 divisors (see below), whose sum is σ = 468927494352. Its totient is φ = 101141223744.

The previous prime is 256684166987. The next prime is 256684167029. The reversal of 256684166990 is 99661486652.

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, 191554679 + ... + 191556018.

It is an arithmetic number, because the mean of its divisors is an integer number (29307968397).

Almost surely, 2^256684166990 is an apocalyptic number.

256684166990 is a deficient number, since it is larger than the sum of its proper divisors (212243327362).

256684166990 is a wasteful number, since it uses less digits than its factorization.

256684166990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383110771.

The product of its (nonzero) digits is 33592320, while the sum is 62.

The spelling of 256684166990 in words is "two hundred fifty-six billion, six hundred eighty-four million, one hundred sixty-six thousand, nine hundred ninety".