155664539 has 2 divisors, whose sum is σ = 155664540. Its totient is φ = 155664538.

The previous prime is 155664503. The next prime is 155664557. The reversal of 155664539 is 935466551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155664539 - 2²⁴ = 138887323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155664539.

It is not a weakly prime, because it can be changed into another prime (155664559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77832269 + 77832270.

It is an arithmetic number, because the mean of its divisors is an integer number (77832270).

Almost surely, 2^155664539 is an apocalyptic number.

155664539 is a deficient number, since it is larger than the sum of its proper divisors (1).

155664539 is an equidigital number, since it uses as much as digits as its factorization.

155664539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486000, while the sum is 44.

The square root of 155664539 is about 12476.5595818719. The cubic root of 155664539 is about 537.9351172198.

The spelling of 155664539 in words is "one hundred fifty-five million, six hundred sixty-four thousand, five hundred thirty-nine".