73125756621 has 12 divisors (see below), whose sum is σ = 107619038748. Its totient is φ = 47830683264.

The previous prime is 73125756607. The next prime is 73125756647. The reversal of 73125756621 is 12665752137.

It is a happy number.

73125756621 is a `hidden beast` number, since 7 + 3 + 12 + 5 + 7 + 5 + 6 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20682466596 + 52443290025 = 143814^2 + 229005^2 .

It is not a de Polignac number, because 73125756621 - 2²⁵ = 73092202189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73125756521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76651260 + ... + 76652213.

It is an arithmetic number, because the mean of its divisors is an integer number (8968253229).

Almost surely, 2^73125756621 is an apocalyptic number.

It is an amenable number.

73125756621 is a deficient number, since it is larger than the sum of its proper divisors (34493282127).

73125756621 is a wasteful number, since it uses less digits than its factorization.

73125756621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153303532 (or 153303529 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The spelling of 73125756621 in words is "seventy-three billion, one hundred twenty-five million, seven hundred fifty-six thousand, six hundred twenty-one".