183651661 has 2 divisors, whose sum is σ = 183651662. Its totient is φ = 183651660.

The previous prime is 183651649. The next prime is 183651691. The reversal of 183651661 is 166156381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101404900 + 82246761 = 10070^2 + 9069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-183651661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 183651661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (183651631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91825830 + 91825831.

It is an arithmetic number, because the mean of its divisors is an integer number (91825831).

Almost surely, 2^183651661 is an apocalyptic number.

It is an amenable number.

183651661 is a deficient number, since it is larger than the sum of its proper divisors (1).

183651661 is an equidigital number, since it uses as much as digits as its factorization.

183651661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 183651661 is about 13551.8139376247. The cubic root of 183651661 is about 568.4142454000.

The spelling of 183651661 in words is "one hundred eighty-three million, six hundred fifty-one thousand, six hundred sixty-one".