165561151101611 has 16 divisors (see below), whose sum is σ = 170838986250240. Its totient is φ = 160364925873120.

The previous prime is 165561151101589. The next prime is 165561151101659. The reversal of 165561151101611 is 116101151165561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165561151101611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165561157101611) 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, 44257775 + ... + 47852616.

It is an arithmetic number, because the mean of its divisors is an integer number (10677436640640).

Almost surely, 2^{165561151101611} is an apocalyptic number.

165561151101611 is a deficient number, since it is larger than the sum of its proper divisors (5277835148629).

165561151101611 is a wasteful number, since it uses less digits than its factorization.

165561151101611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92110834.

The product of its (nonzero) digits is 27000, while the sum is 41.

The spelling of 165561151101611 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, one hundred fifty-one million, one hundred one thousand, six hundred eleven".