400166656 has 36 divisors (see below), whose sum is σ = 800074744. Its totient is φ = 199756800.

The previous prime is 400166653. The next prime is 400166671. The reversal of 400166656 is 656661004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400166653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260611 + ... + 262141.

Almost surely, 2^400166656 is an apocalyptic number.

It is an amenable number.

400166656 is a deficient number, since it is larger than the sum of its proper divisors (399908088).

400166656 is a wasteful number, since it uses less digits than its factorization.

400166656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568 (or 2554 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 400166656 is about 20004.1659661182. The cubic root of 400166656 is about 736.9086131790.

The spelling of 400166656 in words is "four hundred million, one hundred sixty-six thousand, six hundred fifty-six".