125554240521 has 24 divisors (see below), whose sum is σ = 187227772160. Its totient is φ = 80993455200.

The previous prime is 125554240489. The next prime is 125554240531. The reversal of 125554240521 is 125042455521.

125554240521 is a `hidden beast` number, since 1 + 2 + 5 + 55 + 42 + 40 + 521 = 666.

It is not a de Polignac number, because 125554240521 - 2⁵ = 125554240489 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125554240531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3085335 + ... + 3125763.

Almost surely, 2^125554240521 is an apocalyptic number.

It is an amenable number.

125554240521 is a deficient number, since it is larger than the sum of its proper divisors (61673531639).

125554240521 is a wasteful number, since it uses less digits than its factorization.

125554240521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51597 (or 51594 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

The spelling of 125554240521 in words is "one hundred twenty-five billion, five hundred fifty-four million, two hundred forty thousand, five hundred twenty-one".