156156661 has 2 divisors, whose sum is σ = 156156662. Its totient is φ = 156156660.

The previous prime is 156156653. The next prime is 156156697. The reversal of 156156661 is 166651651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97634161 + 58522500 = 9881^2 + 7650^2 .

It is an emirp because it is prime and its reverse (166651651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156156661 - 2³ = 156156653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 156156661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156156601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78078330 + 78078331.

It is an arithmetic number, because the mean of its divisors is an integer number (78078331).

Almost surely, 2^156156661 is an apocalyptic number.

156156661 is the 5589-th centered decagonal number.

It is an amenable number.

156156661 is a deficient number, since it is larger than the sum of its proper divisors (1).

156156661 is an equidigital number, since it uses as much as digits as its factorization.

156156661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 156156661 is about 12496.2658822546. The cubic root of 156156661 is about 538.5014016626.

The spelling of 156156661 in words is "one hundred fifty-six million, one hundred fifty-six thousand, six hundred sixty-one".