157660709 has 2 divisors, whose sum is σ = 157660710. Its totient is φ = 157660708.

The previous prime is 157660691. The next prime is 157660717. The reversal of 157660709 is 907066751.

157660709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145564225 + 12096484 = 12065^2 + 3478^2 .

It is a cyclic number.

It is not a de Polignac number, because 157660709 - 2⁸ = 157660453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157660729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78830354 + 78830355.

It is an arithmetic number, because the mean of its divisors is an integer number (78830355).

Almost surely, 2^157660709 is an apocalyptic number.

It is an amenable number.

157660709 is a deficient number, since it is larger than the sum of its proper divisors (1).

157660709 is an equidigital number, since it uses as much as digits as its factorization.

157660709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 157660709 is about 12556.3015653496. The cubic root of 157660709 is about 540.2247681128.

The spelling of 157660709 in words is "one hundred fifty-seven million, six hundred sixty thousand, seven hundred nine".