125631966916 has 9 divisors (see below), whose sum is σ = 219857182671. Its totient is φ = 62815629012.

The previous prime is 125631966893. The next prime is 125631966947. The reversal of 125631966916 is 619669136521.

The square root of 125631966916 is 354446.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×125631966916² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 620281 + ... + 797503.

Almost surely, 2^125631966916 is an apocalyptic number.

125631966916 is the 354446-th square number.

It is an amenable number.

125631966916 is a deficient number, since it is larger than the sum of its proper divisors (94225215755).

125631966916 is an frugal number, since it uses more digits than its factorization.

125631966916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354450 (or 177225 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 55.

The spelling of 125631966916 in words is "one hundred twenty-five billion, six hundred thirty-one million, nine hundred sixty-six thousand, nine hundred sixteen".