80997587987 has 2 divisors, whose sum is σ = 80997587988. Its totient is φ = 80997587986.

The previous prime is 80997587953. The next prime is 80997588043. The reversal of 80997587987 is 78978579908.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80997587987 is a prime.

It is not a weakly prime, because it can be changed into another prime (80997587387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40498793993 + 40498793994.

It is an arithmetic number, because the mean of its divisors is an integer number (40498793994).

Almost surely, 2^80997587987 is an apocalyptic number.

80997587987 is a deficient number, since it is larger than the sum of its proper divisors (1).

80997587987 is an equidigital number, since it uses as much as digits as its factorization.

80997587987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640120320, while the sum is 77.

The spelling of 80997587987 in words is "eighty billion, nine hundred ninety-seven million, five hundred eighty-seven thousand, nine hundred eighty-seven".