72531221513 has 8 divisors (see below), whose sum is σ = 76463938560. Its totient is φ = 68698067040.

The previous prime is 72531221507. The next prime is 72531221563. The reversal of 72531221513 is 31512213527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72531221513 - 2⁶ = 72531221449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72531221513.

It is not an unprimeable number, because it can be changed into a prime (72531221563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24889148 + ... + 24892061.

It is an arithmetic number, because the mean of its divisors is an integer number (9557992320).

Almost surely, 2^72531221513 is an apocalyptic number.

It is an amenable number.

72531221513 is a deficient number, since it is larger than the sum of its proper divisors (3932717047).

72531221513 is a wasteful number, since it uses less digits than its factorization.

72531221513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49781287.

The product of its digits is 12600, while the sum is 32.

The spelling of 72531221513 in words is "seventy-two billion, five hundred thirty-one million, two hundred twenty-one thousand, five hundred thirteen".