165151531855 has 32 divisors (see below), whose sum is σ = 212538017664. Its totient is φ = 122874149376.

The previous prime is 165151531849. The next prime is 165151531859. The reversal of 165151531855 is 558135151561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165151531855 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165151531859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6339717 + ... + 6365713.

It is an arithmetic number, because the mean of its divisors is an integer number (6641813052).

Almost surely, 2^165151531855 is an apocalyptic number.

165151531855 is a deficient number, since it is larger than the sum of its proper divisors (47386485809).

165151531855 is a wasteful number, since it uses less digits than its factorization.

165151531855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27555.

The product of its digits is 450000, while the sum is 46.

The spelling of 165151531855 in words is "one hundred sixty-five billion, one hundred fifty-one million, five hundred thirty-one thousand, eight hundred fifty-five".