123591621136 has 45 divisors (see below), whose sum is σ = 241295432623. Its totient is φ = 61325428640.

The previous prime is 123591621119. The next prime is 123591621151. The reversal of 123591621136 is 631126195321.

It is a happy number.

The square root of 123591621136 is 351556.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 251713851 + ... + 251714341.

Almost surely, 2^123591621136 is an apocalyptic number.

123591621136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

123591621136 is the 351556-th square number.

It is an amenable number.

123591621136 is a deficient number, since it is larger than the sum of its proper divisors (117703811487).

123591621136 is an frugal number, since it uses more digits than its factorization.

123591621136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348 (or 672 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The spelling of 123591621136 in words is "one hundred twenty-three billion, five hundred ninety-one million, six hundred twenty-one thousand, one hundred thirty-six".