72578387569 has 2 divisors, whose sum is σ = 72578387570. Its totient is φ = 72578387568.

The previous prime is 72578387561. The next prime is 72578387599. The reversal of 72578387569 is 96578387527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36983905344 + 35594482225 = 192312^2 + 188665^2 .

It is a cyclic number.

It is not a de Polignac number, because 72578387569 - 2³ = 72578387561 is a prime.

It is a super-2 number, since 2×72578387569² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72578387561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36289193784 + 36289193785.

It is an arithmetic number, because the mean of its divisors is an integer number (36289193785).

Almost surely, 2^72578387569 is an apocalyptic number.

It is an amenable number.

72578387569 is a deficient number, since it is larger than the sum of its proper divisors (1).

72578387569 is an equidigital number, since it uses as much as digits as its factorization.

72578387569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 177811200, while the sum is 67.

The spelling of 72578387569 in words is "seventy-two billion, five hundred seventy-eight million, three hundred eighty-seven thousand, five hundred sixty-nine".