665100157 has 2 divisors, whose sum is σ = 665100158. Its totient is φ = 665100156.

The previous prime is 665100103. The next prime is 665100169. The reversal of 665100157 is 751001566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 606439876 + 58660281 = 24626^2 + 7659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665100157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665109157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332550078 + 332550079.

It is an arithmetic number, because the mean of its divisors is an integer number (332550079).

Almost surely, 2^665100157 is an apocalyptic number.

It is an amenable number.

665100157 is a deficient number, since it is larger than the sum of its proper divisors (1).

665100157 is an equidigital number, since it uses as much as digits as its factorization.

665100157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 665100157 is about 25789.5358042753. The cubic root of 665100157 is about 872.8956919830.

The spelling of 665100157 in words is "six hundred sixty-five million, one hundred thousand, one hundred fifty-seven".