390166931656 has 8 divisors (see below), whose sum is σ = 731562996870. Its totient is φ = 195083465824.

The previous prime is 390166931653. The next prime is 390166931663. The reversal of 390166931656 is 656139661093.

It can be written as a sum of positive squares in only one way, i.e., 352634068900 + 37532862756 = 593830^2 + 193734^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 390166931597 and 390166931606.

It is not an unprimeable number, because it can be changed into a prime (390166931653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24385433221 + ... + 24385433236.

Almost surely, 2^390166931656 is an apocalyptic number.

It is an amenable number.

390166931656 is a deficient number, since it is larger than the sum of its proper divisors (341396065214).

390166931656 is a wasteful number, since it uses less digits than its factorization.

390166931656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48770866463 (or 48770866459 counting only the distinct ones).

The product of its (nonzero) digits is 4723920, while the sum is 55.

The spelling of 390166931656 in words is "three hundred ninety billion, one hundred sixty-six million, nine hundred thirty-one thousand, six hundred fifty-six".