157765340797 has 4 divisors (see below), whose sum is σ = 157766215516. Its totient is φ = 157764466080.

The previous prime is 157765340767. The next prime is 157765340819. The reversal of 157765340797 is 797043567751.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 797043567751 = 67 ⋅11896172653.

It can be written as a sum of positive squares in 2 ways, for example, as 21594008601 + 136171332196 = 146949^2 + 369014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157765340797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157765340767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55938 + ... + 564499.

It is an arithmetic number, because the mean of its divisors is an integer number (39441553879).

Almost surely, 2^157765340797 is an apocalyptic number.

It is an amenable number.

157765340797 is a deficient number, since it is larger than the sum of its proper divisors (874719).

157765340797 is an equidigital number, since it uses as much as digits as its factorization.

157765340797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874718.

The product of its (nonzero) digits is 38896200, while the sum is 61.

The spelling of 157765340797 in words is "one hundred fifty-seven billion, seven hundred sixty-five million, three hundred forty thousand, seven hundred ninety-seven".