72230071581 has 6 divisors (see below), whose sum is σ = 104332325630. Its totient is φ = 48153381048.

The previous prime is 72230071553. The next prime is 72230071591. The reversal of 72230071581 is 18517003227.

72230071581 is a `hidden beast` number, since 7 + 2 + 2 + 3 + 0 + 0 + 71 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45101016900 + 27129054681 = 212370^2 + 164709^2 .

It is not a de Polignac number, because 72230071581 - 2⁷ = 72230071453 is a prime.

It is a super-2 number, since 2×72230071581² (a number of 23 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 (72230071591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4012781746 + ... + 4012781763.

Almost surely, 2^72230071581 is an apocalyptic number.

It is an amenable number.

72230071581 is a deficient number, since it is larger than the sum of its proper divisors (32102254049).

72230071581 is a wasteful number, since it uses less digits than its factorization.

72230071581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8025563515 (or 8025563512 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

It can be divided in two parts, 722300 and 71581, that added together give a square (793881 = 891²).

The spelling of 72230071581 in words is "seventy-two billion, two hundred thirty million, seventy-one thousand, five hundred eighty-one".