256640046652 has 12 divisors (see below), whose sum is σ = 489949180056. Its totient is φ = 116654566640.

The previous prime is 256640046617. The next prime is 256640046659.

256640046652 is nontrivially palindromic in base 10.

256640046652 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256640046652² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256640046659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2916364123 + ... + 2916364210.

It is an arithmetic number, because the mean of its divisors is an integer number (40829098338).

Almost surely, 2^256640046652 is an apocalyptic number.

256640046652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256640046652 is a deficient number, since it is larger than the sum of its proper divisors (233309133404).

256640046652 is a wasteful number, since it uses less digits than its factorization.

256640046652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5832728348 (or 5832728346 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 256640046652 in words is "two hundred fifty-six billion, six hundred forty million, forty-six thousand, six hundred fifty-two".