157696639 has 2 divisors, whose sum is σ = 157696640. Its totient is φ = 157696638.

The previous prime is 157696613. The next prime is 157696657. The reversal of 157696639 is 936696751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157696639 - 2¹¹ = 157694591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157696339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78848319 + 78848320.

It is an arithmetic number, because the mean of its divisors is an integer number (78848320).

Almost surely, 2^157696639 is an apocalyptic number.

157696639 is a deficient number, since it is larger than the sum of its proper divisors (1).

157696639 is an equidigital number, since it uses as much as digits as its factorization.

157696639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 52.

The square root of 157696639 is about 12557.7322395407. The cubic root of 157696639 is about 540.2658030706.

The spelling of 157696639 in words is "one hundred fifty-seven million, six hundred ninety-six thousand, six hundred thirty-nine".