72587571977 has 2 divisors, whose sum is σ = 72587571978. Its totient is φ = 72587571976.

The previous prime is 72587571971. The next prime is 72587572049. The reversal of 72587571977 is 77917578527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68771915536 + 3815656441 = 262244^2 + 61771^2 .

It is a cyclic number.

It is not a de Polignac number, because 72587571977 - 2²² = 72583377673 is a prime.

It is not a weakly prime, because it can be changed into another prime (72587571971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36293785988 + 36293785989.

It is an arithmetic number, because the mean of its divisors is an integer number (36293785989).

Almost surely, 2^72587571977 is an apocalyptic number.

It is an amenable number.

72587571977 is a deficient number, since it is larger than the sum of its proper divisors (1).

72587571977 is an equidigital number, since it uses as much as digits as its factorization.

72587571977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60505200, while the sum is 65.

The spelling of 72587571977 in words is "seventy-two billion, five hundred eighty-seven million, five hundred seventy-one thousand, nine hundred seventy-seven".