80814813977 has 2 divisors, whose sum is σ = 80814813978. Its totient is φ = 80814813976.

The previous prime is 80814813971. The next prime is 80814814099. The reversal of 80814813977 is 77931841808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80034673216 + 780140761 = 282904^2 + 27931^2 .

It is a cyclic number.

It is not a de Polignac number, because 80814813977 - 2⁸ = 80814813721 is a prime.

It is a super-2 number, since 2×80814813977² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80814813971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40407406988 + 40407406989.

It is an arithmetic number, because the mean of its divisors is an integer number (40407406989).

Almost surely, 2^80814813977 is an apocalyptic number.

It is an amenable number.

80814813977 is a deficient number, since it is larger than the sum of its proper divisors (1).

80814813977 is an equidigital number, since it uses as much as digits as its factorization.

80814813977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 56.

The spelling of 80814813977 in words is "eighty billion, eight hundred fourteen million, eight hundred thirteen thousand, nine hundred seventy-seven".