155664629 has 2 divisors, whose sum is σ = 155664630. Its totient is φ = 155664628.

The previous prime is 155664599. The next prime is 155664637. The reversal of 155664629 is 926466551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143400625 + 12264004 = 11975^2 + 3502^2 .

It is an emirp because it is prime and its reverse (926466551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155664629 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155664629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155664679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77832314 + 77832315.

It is an arithmetic number, because the mean of its divisors is an integer number (77832315).

Almost surely, 2^155664629 is an apocalyptic number.

It is an amenable number.

155664629 is a deficient number, since it is larger than the sum of its proper divisors (1).

155664629 is an equidigital number, since it uses as much as digits as its factorization.

155664629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 44.

The square root of 155664629 is about 12476.5631886349. The cubic root of 155664629 is about 537.9352208918.

The spelling of 155664629 in words is "one hundred fifty-five million, six hundred sixty-four thousand, six hundred twenty-nine".