156394661 has 2 divisors, whose sum is σ = 156394662. Its totient is φ = 156394660.

The previous prime is 156394657. The next prime is 156394673. The reversal of 156394661 is 166493651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127825636 + 28569025 = 11306^2 + 5345^2 .

It is a cyclic number.

It is not a de Polignac number, because 156394661 - 2² = 156394657 is a prime.

It is a Chen prime.

It is equal to p_8783591 and since 156394661 and 8783591 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156394631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78197330 + 78197331.

It is an arithmetic number, because the mean of its divisors is an integer number (78197331).

Almost surely, 2^156394661 is an apocalyptic number.

It is an amenable number.

156394661 is a deficient number, since it is larger than the sum of its proper divisors (1).

156394661 is an equidigital number, since it uses as much as digits as its factorization.

156394661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 156394661 is about 12505.7851013041. The cubic root of 156394661 is about 538.7748413314.

The spelling of 156394661 in words is "one hundred fifty-six million, three hundred ninety-four thousand, six hundred sixty-one".