155664697 has 2 divisors, whose sum is σ = 155664698. Its totient is φ = 155664696.

The previous prime is 155664679. The next prime is 155664749. The reversal of 155664697 is 796466551.

Together with previous prime (155664679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94887081 + 60777616 = 9741^2 + 7796^2 .

It is a cyclic number.

It is not a de Polignac number, because 155664697 - 2¹⁹ = 155140409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155664697.

It is not a weakly prime, because it can be changed into another prime (155664637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77832348 + 77832349.

It is an arithmetic number, because the mean of its divisors is an integer number (77832349).

Almost surely, 2^155664697 is an apocalyptic number.

It is an amenable number.

155664697 is a deficient number, since it is larger than the sum of its proper divisors (1).

155664697 is an equidigital number, since it uses as much as digits as its factorization.

155664697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 49.

The square root of 155664697 is about 12476.5659137441. The cubic root of 155664697 is about 537.9352992217.

The spelling of 155664697 in words is "one hundred fifty-five million, six hundred sixty-four thousand, six hundred ninety-seven".