31665306157 has 2 divisors, whose sum is σ = 31665306158. Its totient is φ = 31665306156.

The previous prime is 31665306073. The next prime is 31665306191. The reversal of 31665306157 is 75160356613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18187489321 + 13477816836 = 134861^2 + 116094^2 .

It is a cyclic number.

It is not a de Polignac number, because 31665306157 - 2¹⁵ = 31665273389 is a prime.

It is a super-2 number, since 2×31665306157² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31665106157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15832653078 + 15832653079.

It is an arithmetic number, because the mean of its divisors is an integer number (15832653079).

Almost surely, 2^31665306157 is an apocalyptic number.

It is an amenable number.

31665306157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31665306157 is an equidigital number, since it uses as much as digits as its factorization.

31665306157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 43.

The spelling of 31665306157 in words is "thirty-one billion, six hundred sixty-five million, three hundred six thousand, one hundred fifty-seven".