381731631656 has 8 divisors (see below), whose sum is σ = 715746809370. Its totient is φ = 190865815824.

The previous prime is 381731631607. The next prime is 381731631667. The reversal of 381731631656 is 656136137183.

It can be written as a sum of positive squares in only one way, i.e., 351452151556 + 30279480100 = 592834^2 + 174010^2 .

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

It is a super-2 number, since 2×381731631656² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23858226971 + ... + 23858226986.

Almost surely, 2^381731631656 is an apocalyptic number.

It is an amenable number.

381731631656 is a deficient number, since it is larger than the sum of its proper divisors (334015177714).

381731631656 is a wasteful number, since it uses less digits than its factorization.

381731631656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47716453963 (or 47716453959 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 50.

The spelling of 381731631656 in words is "three hundred eighty-one billion, seven hundred thirty-one million, six hundred thirty-one thousand, six hundred fifty-six".