180664637 has 2 divisors, whose sum is σ = 180664638. Its totient is φ = 180664636.

The previous prime is 180664633. The next prime is 180664639. The reversal of 180664637 is 736466081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177928921 + 2735716 = 13339^2 + 1654^2 .

It is a cyclic number.

It is not a de Polignac number, because 180664637 - 2² = 180664633 is a prime.

It is a super-2 number, since 2×180664637² = 65279422124683538, which contains 22 as substring.

Together with 180664639, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 180664594 and 180664603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180664633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90332318 + 90332319.

It is an arithmetic number, because the mean of its divisors is an integer number (90332319).

Almost surely, 2^180664637 is an apocalyptic number.

It is an amenable number.

180664637 is a deficient number, since it is larger than the sum of its proper divisors (1).

180664637 is an equidigital number, since it uses as much as digits as its factorization.

180664637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 180664637 is about 13441.1546007030. The cubic root of 180664637 is about 565.3157052530.

The spelling of 180664637 in words is "one hundred eighty million, six hundred sixty-four thousand, six hundred thirty-seven".