157766345820931 has 2 divisors, whose sum is σ = 157766345820932. Its totient is φ = 157766345820930.

The previous prime is 157766345820917. The next prime is 157766345820959. The reversal of 157766345820931 is 139028543667751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157766345820931 - 2³⁷ = 157628906867459 is a prime.

It is a super-4 number, since 4×157766345820931⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (157766345820901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78883172910465 + 78883172910466.

It is an arithmetic number, because the mean of its divisors is an integer number (78883172910466).

It is a 1-persistent number, because it is pandigital, but 2⋅157766345820931 = 315532691641862 is not.

Almost surely, 2^{157766345820931} is an apocalyptic number.

157766345820931 is a deficient number, since it is larger than the sum of its proper divisors (1).

157766345820931 is an equidigital number, since it uses as much as digits as its factorization.

157766345820931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 228614400, while the sum is 67.

The spelling of 157766345820931 in words is "one hundred fifty-seven trillion, seven hundred sixty-six billion, three hundred forty-five million, eight hundred twenty thousand, nine hundred thirty-one".