157666865723 has 2 divisors, whose sum is σ = 157666865724. Its totient is φ = 157666865722.

The previous prime is 157666865711. The next prime is 157666865731. The reversal of 157666865723 is 327568666751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157666865723 - 2¹⁴ = 157666849339 is a prime.

It is not a weakly prime, because it can be changed into another prime (157666865743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78833432861 + 78833432862.

It is an arithmetic number, because the mean of its divisors is an integer number (78833432862).

Almost surely, 2^157666865723 is an apocalyptic number.

157666865723 is a deficient number, since it is larger than the sum of its proper divisors (1).

157666865723 is an equidigital number, since it uses as much as digits as its factorization.

157666865723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76204800, while the sum is 62.

The spelling of 157666865723 in words is "one hundred fifty-seven billion, six hundred sixty-six million, eight hundred sixty-five thousand, seven hundred twenty-three".