80439999977 has 2 divisors, whose sum is σ = 80439999978. Its totient is φ = 80439999976.

The previous prime is 80439999953. The next prime is 80440000021. The reversal of 80439999977 is 77999993408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55292700736 + 25147299241 = 235144^2 + 158579^2 .

It is a cyclic number.

It is not a de Polignac number, because 80439999977 - 2¹⁶ = 80439934441 is a prime.

It is not a weakly prime, because it can be changed into another prime (80439999907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40219999988 + 40219999989.

It is an arithmetic number, because the mean of its divisors is an integer number (40219999989).

Almost surely, 2^80439999977 is an apocalyptic number.

It is an amenable number.

80439999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

80439999977 is an equidigital number, since it uses as much as digits as its factorization.

80439999977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 277766496, while the sum is 74.

The spelling of 80439999977 in words is "eighty billion, four hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".