73136243521 has 16 divisors (see below), whose sum is σ = 80052553728. Its totient is φ = 66264912000.

The previous prime is 73136243503. The next prime is 73136243561. The reversal of 73136243521 is 12534263137.

It is a cyclic number.

It is not a de Polignac number, because 73136243521 - 2¹³ = 73136235329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73136243561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4043520 + ... + 4061566.

It is an arithmetic number, because the mean of its divisors is an integer number (5003284608).

Almost surely, 2^73136243521 is an apocalyptic number.

It is an amenable number.

73136243521 is a deficient number, since it is larger than the sum of its proper divisors (6916310207).

73136243521 is a wasteful number, since it uses less digits than its factorization.

73136243521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19272.

The product of its digits is 90720, while the sum is 37.

The spelling of 73136243521 in words is "seventy-three billion, one hundred thirty-six million, two hundred forty-three thousand, five hundred twenty-one".