165161155611 has 16 divisors (see below), whose sum is σ = 222694093440. Its totient is φ = 108872480640.

The previous prime is 165161155591. The next prime is 165161155613. The reversal of 165161155611 is 116551161561.

It is not a de Polignac number, because 165161155611 - 2²⁷ = 165026937883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165161155611.

It is not an unprimeable number, because it can be changed into a prime (165161155613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439345 + ... + 723426.

It is an arithmetic number, because the mean of its divisors is an integer number (13918380840).

Almost surely, 2^165161155611 is an apocalyptic number.

165161155611 is a deficient number, since it is larger than the sum of its proper divisors (57532937829).

165161155611 is a wasteful number, since it uses less digits than its factorization.

165161155611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163306.

The product of its digits is 27000, while the sum is 39.

The spelling of 165161155611 in words is "one hundred sixty-five billion, one hundred sixty-one million, one hundred fifty-five thousand, six hundred eleven".