156123661 has 2 divisors, whose sum is σ = 156123662. Its totient is φ = 156123660.

The previous prime is 156123641. The next prime is 156123689. The reversal of 156123661 is 166321651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87067561 + 69056100 = 9331^2 + 8310^2 .

It is a cyclic number.

It is not a de Polignac number, because 156123661 - 2⁵ = 156123629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156123641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78061830 + 78061831.

It is an arithmetic number, because the mean of its divisors is an integer number (78061831).

Almost surely, 2^156123661 is an apocalyptic number.

It is an amenable number.

156123661 is a deficient number, since it is larger than the sum of its proper divisors (1).

156123661 is an equidigital number, since it uses as much as digits as its factorization.

156123661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 156123661 is about 12494.9454180481. The cubic root of 156123661 is about 538.4634658314.

The spelling of 156123661 in words is "one hundred fifty-six million, one hundred twenty-three thousand, six hundred sixty-one".