165215611655207 has 4 divisors (see below), whose sum is σ = 165215778796800. Its totient is φ = 165215444513616.

The previous prime is 165215611655189. The next prime is 165215611655239. The reversal of 165215611655207 is 702556116512561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165215611655207 is a prime.

It is a super-2 number, since 2×165215611655207² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165215611655267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82079207 + ... + 84067992.

It is an arithmetic number, because the mean of its divisors is an integer number (41303944699200).

Almost surely, 2^{165215611655207} is an apocalyptic number.

165215611655207 is a deficient number, since it is larger than the sum of its proper divisors (167141593).

165215611655207 is an equidigital number, since it uses as much as digits as its factorization.

165215611655207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167141592.

The product of its (nonzero) digits is 3780000, while the sum is 53.

The spelling of 165215611655207 in words is "one hundred sixty-five trillion, two hundred fifteen billion, six hundred eleven million, six hundred fifty-five thousand, two hundred seven".