77190978071 has 2 divisors, whose sum is σ = 77190978072. Its totient is φ = 77190978070.

The previous prime is 77190978047. The next prime is 77190978089. The reversal of 77190978071 is 17087909177.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77190978071 - 2³⁴ = 60011108887 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 77190977998 and 77190978016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77190978091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38595489035 + 38595489036.

It is an arithmetic number, because the mean of its divisors is an integer number (38595489036).

Almost surely, 2^77190978071 is an apocalyptic number.

77190978071 is a deficient number, since it is larger than the sum of its proper divisors (1).

77190978071 is an equidigital number, since it uses as much as digits as its factorization.

77190978071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555848, while the sum is 56.

The spelling of 77190978071 in words is "seventy-seven billion, one hundred ninety million, nine hundred seventy-eight thousand, seventy-one".