20165388157 has 2 divisors, whose sum is σ = 20165388158. Its totient is φ = 20165388156.

The previous prime is 20165388137. The next prime is 20165388227. The reversal of 20165388157 is 75188356102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14850103321 + 5315284836 = 121861^2 + 72906^2 .

It is a cyclic number.

It is not a de Polignac number, because 20165388157 - 2⁷ = 20165388029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20165388137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082694078 + 10082694079.

It is an arithmetic number, because the mean of its divisors is an integer number (10082694079).

Almost surely, 2^20165388157 is an apocalyptic number.

It is an amenable number.

20165388157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20165388157 is an equidigital number, since it uses as much as digits as its factorization.

20165388157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 20165388157 in words is "twenty billion, one hundred sixty-five million, three hundred eighty-eight thousand, one hundred fifty-seven".