121725627664 has 15 divisors (see below), whose sum is σ = 235846107543. Its totient is φ = 60862116048.

The previous prime is 121725627553. The next prime is 121725627701. The reversal of 121725627664 is 466726527121.

The square root of 121725627664 is 348892.

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 2 ways as a sum of consecutive naturals, for example, 1351957 + ... + 1439179.

Almost surely, 2^121725627664 is an apocalyptic number.

121725627664 is the 348892-nd square number.

It is an amenable number.

121725627664 is a deficient number, since it is larger than the sum of its proper divisors (114120479879).

121725627664 is an frugal number, since it uses more digits than its factorization.

121725627664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174454 (or 87225 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 49.

Multiplying 121725627664 by its sum of digits (49), we get a square (5964555755536 = 2442244²).

The spelling of 121725627664 in words is "one hundred twenty-one billion, seven hundred twenty-five million, six hundred twenty-seven thousand, six hundred sixty-four".