72566305430581 has 4 divisors (see below), whose sum is σ = 72566412918912. Its totient is φ = 72566197942252.

The previous prime is 72566305430543. The next prime is 72566305430621. The reversal of 72566305430581 is 18503450366527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72566305430581 - 2²⁷ = 72566171212853 is a prime.

It is a super-2 number, since 2×72566305430581² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72566305430501) 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, 52725061 + ... + 54083866.

It is an arithmetic number, because the mean of its divisors is an integer number (18141603229728).

Almost surely, 2^{72566305430581} is an apocalyptic number.

It is an amenable number.

72566305430581 is a deficient number, since it is larger than the sum of its proper divisors (107488331).

72566305430581 is a wasteful number, since it uses less digits than its factorization.

72566305430581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107488330.

The product of its (nonzero) digits is 18144000, while the sum is 55.

The spelling of 72566305430581 in words is "seventy-two trillion, five hundred sixty-six billion, three hundred five million, four hundred thirty thousand, five hundred eighty-one".