157665413 has 2 divisors, whose sum is σ = 157665414. Its totient is φ = 157665412.

The previous prime is 157665383. The next prime is 157665427. The reversal of 157665413 is 314566751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141681409 + 15984004 = 11903^2 + 3998^2 .

It is a cyclic number.

It is not a de Polignac number, because 157665413 - 2¹⁰ = 157664389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157665433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78832706 + 78832707.

It is an arithmetic number, because the mean of its divisors is an integer number (78832707).

Almost surely, 2^157665413 is an apocalyptic number.

It is an amenable number.

157665413 is a deficient number, since it is larger than the sum of its proper divisors (1).

157665413 is an equidigital number, since it uses as much as digits as its factorization.

157665413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 157665413 is about 12556.4888802563. The cubic root of 157665413 is about 540.2301408149.

The spelling of 157665413 in words is "one hundred fifty-seven million, six hundred sixty-five thousand, four hundred thirteen".