72521539157 has 2 divisors, whose sum is σ = 72521539158. Its totient is φ = 72521539156.

The previous prime is 72521539127. The next prime is 72521539213. The reversal of 72521539157 is 75193512527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72146497201 + 375041956 = 268601^2 + 19366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72521539157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72521539117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36260769578 + 36260769579.

It is an arithmetic number, because the mean of its divisors is an integer number (36260769579).

Almost surely, 2^72521539157 is an apocalyptic number.

It is an amenable number.

72521539157 is a deficient number, since it is larger than the sum of its proper divisors (1).

72521539157 is an equidigital number, since it uses as much as digits as its factorization.

72521539157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 661500, while the sum is 47.

The spelling of 72521539157 in words is "seventy-two billion, five hundred twenty-one million, five hundred thirty-nine thousand, one hundred fifty-seven".