125421991046416 has 45 divisors (see below), whose sum is σ = 243486461401669. Its totient is φ = 62587020423488.

The previous prime is 125421991046371. The next prime is 125421991046419. The reversal of 125421991046416 is 614640199124521.

It is a happy number.

The square root of 125421991046416 is 11199196.

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

It can be written as a sum of positive squares in only one way, i.e., 81347050947600 + 44074940098816 = 9019260^2 + 6638896^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125421991046419) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25220586906 + ... + 25220591878.

Almost surely, 2^{125421991046416} is an apocalyptic number.

125421991046416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

125421991046416 is the 11199196-th square number.

It is an amenable number.

125421991046416 is a deficient number, since it is larger than the sum of its proper divisors (118064470355253).

125421991046416 is an frugal number, since it uses more digits than its factorization.

125421991046416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11080 (or 5538 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 125421991046416 in words is "one hundred twenty-five trillion, four hundred twenty-one billion, nine hundred ninety-one million, forty-six thousand, four hundred sixteen".