72507313591 has 4 divisors (see below), whose sum is σ = 72510881184. Its totient is φ = 72503746000.

The previous prime is 72507313579. The next prime is 72507313601. The reversal of 72507313591 is 19531370527.

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

It is a cyclic number.

It is not a de Polignac number, because 72507313591 - 2¹³ = 72507305399 is a prime.

It is a super-2 number, since 2×72507313591² (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 (72507313891) 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, 1753135 + ... + 1794016.

It is an arithmetic number, because the mean of its divisors is an integer number (18127720296).

Almost surely, 2^72507313591 is an apocalyptic number.

72507313591 is a deficient number, since it is larger than the sum of its proper divisors (3567593).

72507313591 is a wasteful number, since it uses less digits than its factorization.

72507313591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3567592.

The product of its (nonzero) digits is 198450, while the sum is 43.

The spelling of 72507313591 in words is "seventy-two billion, five hundred seven million, three hundred thirteen thousand, five hundred ninety-one".