77922491291 has 2 divisors, whose sum is σ = 77922491292. Its totient is φ = 77922491290.

The previous prime is 77922491243. The next prime is 77922491321. The reversal of 77922491291 is 19219422977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77922491291 - 2¹⁴ = 77922474907 is a prime.

It is not a weakly prime, because it can be changed into another prime (77922491791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38961245645 + 38961245646.

It is an arithmetic number, because the mean of its divisors is an integer number (38961245646).

Almost surely, 2^77922491291 is an apocalyptic number.

77922491291 is a deficient number, since it is larger than the sum of its proper divisors (1).

77922491291 is an equidigital number, since it uses as much as digits as its factorization.

77922491291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The spelling of 77922491291 in words is "seventy-seven billion, nine hundred twenty-two million, four hundred ninety-one thousand, two hundred ninety-one".