77172428474971 has 2 divisors, whose sum is σ = 77172428474972. Its totient is φ = 77172428474970.

The previous prime is 77172428474929. The next prime is 77172428474987. The reversal of 77172428474971 is 17947482427177.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77172428474971 - 2¹⁵ = 77172428442203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77172428474971.

It is not a weakly prime, because it can be changed into another prime (77172428474171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38586214237485 + 38586214237486.

It is an arithmetic number, because the mean of its divisors is an integer number (38586214237486).

Almost surely, 2^{77172428474971} is an apocalyptic number.

77172428474971 is a deficient number, since it is larger than the sum of its proper divisors (1).

77172428474971 is an equidigital number, since it uses as much as digits as its factorization.

77172428474971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 309786624, while the sum is 70.

The spelling of 77172428474971 in words is "seventy-seven trillion, one hundred seventy-two billion, four hundred twenty-eight million, four hundred seventy-four thousand, nine hundred seventy-one".