77740093391 has 2 divisors, whose sum is σ = 77740093392. Its totient is φ = 77740093390.

The previous prime is 77740093349. The next prime is 77740093471. The reversal of 77740093391 is 19339004777.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77740093391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77740093331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38870046695 + 38870046696.

It is an arithmetic number, because the mean of its divisors is an integer number (38870046696).

Almost surely, 2^77740093391 is an apocalyptic number.

77740093391 is a deficient number, since it is larger than the sum of its proper divisors (1).

77740093391 is an equidigital number, since it uses as much as digits as its factorization.

77740093391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000188, while the sum is 50.

The spelling of 77740093391 in words is "seventy-seven billion, seven hundred forty million, ninety-three thousand, three hundred ninety-one".