811773912977 has 2 divisors, whose sum is σ = 811773912978. Its totient is φ = 811773912976.

The previous prime is 811773912941. The next prime is 811773913007. The reversal of 811773912977 is 779219377118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 459174285376 + 352599627601 = 677624^2 + 593801^2 .

It is a cyclic number.

It is not a de Polignac number, because 811773912977 - 2³⁸ = 536896006033 is a prime.

It is not a weakly prime, because it can be changed into another prime (811773912277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405886956488 + 405886956489.

It is an arithmetic number, because the mean of its divisors is an integer number (405886956489).

Almost surely, 2^811773912977 is an apocalyptic number.

It is an amenable number.

811773912977 is a deficient number, since it is larger than the sum of its proper divisors (1).

811773912977 is an equidigital number, since it uses as much as digits as its factorization.

811773912977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9335088, while the sum is 62.

The spelling of 811773912977 in words is "eight hundred eleven billion, seven hundred seventy-three million, nine hundred twelve thousand, nine hundred seventy-seven".