80421137977 has 2 divisors, whose sum is σ = 80421137978. Its totient is φ = 80421137976.

The previous prime is 80421137947. The next prime is 80421137983. The reversal of 80421137977 is 77973112408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45033508521 + 35387629456 = 212211^2 + 188116^2 .

It is a cyclic number.

It is not a de Polignac number, because 80421137977 - 2¹¹ = 80421135929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80421137977.

It is not a weakly prime, because it can be changed into another prime (80421137947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40210568988 + 40210568989.

It is an arithmetic number, because the mean of its divisors is an integer number (40210568989).

Almost surely, 2^80421137977 is an apocalyptic number.

It is an amenable number.

80421137977 is a deficient number, since it is larger than the sum of its proper divisors (1).

80421137977 is an equidigital number, since it uses as much as digits as its factorization.

80421137977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 592704, while the sum is 49.

The spelling of 80421137977 in words is "eighty billion, four hundred twenty-one million, one hundred thirty-seven thousand, nine hundred seventy-seven".