159756661 has 2 divisors, whose sum is σ = 159756662. Its totient is φ = 159756660.

The previous prime is 159756637. The next prime is 159756673. The reversal of 159756661 is 166657951.

159756661 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., 151142436 + 8614225 = 12294^2 + 2935^2 .

It is an emirp because it is prime and its reverse (166657951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 159756661 - 2⁵ = 159756629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159756061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79878330 + 79878331.

It is an arithmetic number, because the mean of its divisors is an integer number (79878331).

Almost surely, 2^159756661 is an apocalyptic number.

It is an amenable number.

159756661 is a deficient number, since it is larger than the sum of its proper divisors (1).

159756661 is an equidigital number, since it uses as much as digits as its factorization.

159756661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 46.

The square root of 159756661 is about 12639.4881621053. The cubic root of 159756661 is about 542.6081654822.

The spelling of 159756661 in words is "one hundred fifty-nine million, seven hundred fifty-six thousand, six hundred sixty-one".