72132613081 has 4 divisors (see below), whose sum is σ = 72259384500. Its totient is φ = 72005841664.

The previous prime is 72132613043. The next prime is 72132613169. The reversal of 72132613081 is 18031623127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13042782025 + 59089831056 = 114205^2 + 243084^2 .

It is a cyclic number.

It is not a de Polignac number, because 72132613081 - 2³¹ = 69985129433 is a prime.

It is a super-2 number, since 2×72132613081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72132613381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63384856 + ... + 63385993.

It is an arithmetic number, because the mean of its divisors is an integer number (18064846125).

Almost surely, 2^72132613081 is an apocalyptic number.

It is an amenable number.

72132613081 is a deficient number, since it is larger than the sum of its proper divisors (126771419).

72132613081 is a wasteful number, since it uses less digits than its factorization.

72132613081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126771418.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 72132613081 in words is "seventy-two billion, one hundred thirty-two million, six hundred thirteen thousand, eighty-one".