155664503 has 2 divisors, whose sum is σ = 155664504. Its totient is φ = 155664502.

The previous prime is 155664499. The next prime is 155664539. The reversal of 155664503 is 305466551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155664503 - 2² = 155664499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155664583) 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, 77832251 + 77832252.

It is an arithmetic number, because the mean of its divisors is an integer number (77832252).

Almost surely, 2^155664503 is an apocalyptic number.

155664503 is a deficient number, since it is larger than the sum of its proper divisors (1).

155664503 is an equidigital number, since it uses as much as digits as its factorization.

155664503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 155664503 is about 12476.5581391664. The cubic root of 155664503 is about 537.9350757510.

The spelling of 155664503 in words is "one hundred fifty-five million, six hundred sixty-four thousand, five hundred three".