72521539199 has 4 divisors (see below), whose sum is σ = 75022281960. Its totient is φ = 70020796440.

The previous prime is 72521539157. The next prime is 72521539213. The reversal of 72521539199 is 99193512527.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72521539199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72521539199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72521530199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250371337 + ... + 1250371394.

It is an arithmetic number, because the mean of its divisors is an integer number (18755570490).

Almost surely, 2^72521539199 is an apocalyptic number.

72521539199 is a deficient number, since it is larger than the sum of its proper divisors (2500742761).

72521539199 is a wasteful number, since it uses less digits than its factorization.

72521539199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500742760.

The product of its digits is 1530900, while the sum is 53.

It can be divided in two parts, 7252 and 1539199, that added together give a palindrome (1546451).

The spelling of 72521539199 in words is "seventy-two billion, five hundred twenty-one million, five hundred thirty-nine thousand, one hundred ninety-nine".