256688903469 has 8 divisors (see below), whose sum is σ = 350211217312. Its totient is φ = 167146262640.

The previous prime is 256688903431. The next prime is 256688903489. The reversal of 256688903469 is 964309886652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256688903469 - 2¹⁷ = 256688772397 is a prime.

It is a super-2 number, since 2×256688903469² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256688903489) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 994918102 + ... + 994918359.

It is an arithmetic number, because the mean of its divisors is an integer number (43776402164).

Almost surely, 2^256688903469 is an apocalyptic number.

It is an amenable number.

256688903469 is a deficient number, since it is larger than the sum of its proper divisors (93522313843).

256688903469 is a wasteful number, since it uses less digits than its factorization.

256688903469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989836507.

The product of its (nonzero) digits is 134369280, while the sum is 66.

The spelling of 256688903469 in words is "two hundred fifty-six billion, six hundred eighty-eight million, nine hundred three thousand, four hundred sixty-nine".