155664331641565 has 8 divisors (see below), whose sum is σ = 188450270518968. Its totient is φ = 123429416947200.

The previous prime is 155664331641547. The next prime is 155664331641571. The reversal of 155664331641565 is 565146133466551.

155664331641565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9524593405636 + 146139738235929 = 3086194^2 + 12088827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155664331641565 - 2⁹ = 155664331641053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137756045136 + ... + 137756046265.

It is an arithmetic number, because the mean of its divisors is an integer number (23556283814871).

Almost surely, 2^{155664331641565} is an apocalyptic number.

It is an amenable number.

155664331641565 is a deficient number, since it is larger than the sum of its proper divisors (32785938877403).

155664331641565 is a wasteful number, since it uses less digits than its factorization.

155664331641565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275512091519.

The product of its digits is 116640000, while the sum is 61.

The spelling of 155664331641565 in words is "one hundred fifty-five trillion, six hundred sixty-four billion, three hundred thirty-one million, six hundred forty-one thousand, five hundred sixty-five".