157166512021 has 2 divisors, whose sum is σ = 157166512022. Its totient is φ = 157166512020.

The previous prime is 157166511937. The next prime is 157166512073. The reversal of 157166512021 is 120215661751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89706839121 + 67459672900 = 299511^2 + 259730^2 .

It is a cyclic number.

It is not a de Polignac number, because 157166512021 - 2¹⁷ = 157166380949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157166512081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78583256010 + 78583256011.

It is an arithmetic number, because the mean of its divisors is an integer number (78583256011).

Almost surely, 2^157166512021 is an apocalyptic number.

It is an amenable number.

157166512021 is a deficient number, since it is larger than the sum of its proper divisors (1).

157166512021 is an equidigital number, since it uses as much as digits as its factorization.

157166512021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 157166512021 in words is "one hundred fifty-seven billion, one hundred sixty-six million, five hundred twelve thousand, twenty-one".