72206500581 has 24 divisors (see below), whose sum is σ = 106833677184. Its totient is φ = 46973566080.

The previous prime is 72206500579. The next prime is 72206500627. The reversal of 72206500581 is 18500560227.

It is a happy number.

72206500581 is a `hidden beast` number, since 7 + 2 + 20 + 6 + 50 + 0 + 581 = 666.

It is not a de Polignac number, because 72206500581 - 2¹ = 72206500579 is a prime.

It is a super-2 number, since 2×72206500581² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72206500981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110715 + ... + 395816.

It is an arithmetic number, because the mean of its divisors is an integer number (4451403216).

Almost surely, 2^72206500581 is an apocalyptic number.

It is an amenable number.

72206500581 is a deficient number, since it is larger than the sum of its proper divisors (34627176603).

72206500581 is a wasteful number, since it uses less digits than its factorization.

72206500581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506921 (or 506918 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 72206500581 in words is "seventy-two billion, two hundred six million, five hundred thousand, five hundred eighty-one".