157765783380791 has 2 divisors, whose sum is σ = 157765783380792. Its totient is φ = 157765783380790.

The previous prime is 157765783380757. The next prime is 157765783380811. The reversal of 157765783380791 is 197083387567751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157765783380791 - 2²² = 157765779186487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157765783380721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78882891690395 + 78882891690396.

It is an arithmetic number, because the mean of its divisors is an integer number (78882891690396).

Almost surely, 2^{157765783380791} is an apocalyptic number.

157765783380791 is a deficient number, since it is larger than the sum of its proper divisors (1).

157765783380791 is an equidigital number, since it uses as much as digits as its factorization.

157765783380791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1867017600, while the sum is 77.

The spelling of 157765783380791 in words is "one hundred fifty-seven trillion, seven hundred sixty-five billion, seven hundred eighty-three million, three hundred eighty thousand, seven hundred ninety-one".