159551657 has 2 divisors, whose sum is σ = 159551658. Its totient is φ = 159551656.

The previous prime is 159551627. The next prime is 159551669. The reversal of 159551657 is 756155951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98883136 + 60668521 = 9944^2 + 7789^2 .

It is an emirp because it is prime and its reverse (756155951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 159551657 - 2⁸ = 159551401 is a prime.

It is not a weakly prime, because it can be changed into another prime (159551627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79775828 + 79775829.

It is an arithmetic number, because the mean of its divisors is an integer number (79775829).

Almost surely, 2^159551657 is an apocalyptic number.

It is an amenable number.

159551657 is a deficient number, since it is larger than the sum of its proper divisors (1).

159551657 is an equidigital number, since it uses as much as digits as its factorization.

159551657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 236250, while the sum is 44.

The square root of 159551657 is about 12631.3758949688. The cubic root of 159551657 is about 542.3759697200.

The spelling of 159551657 in words is "one hundred fifty-nine million, five hundred fifty-one thousand, six hundred fifty-seven".