165510060661 has 24 divisors (see below), whose sum is σ = 184316549760. Its totient is φ = 148486990080.

The previous prime is 165510060641. The next prime is 165510060673. The reversal of 165510060661 is 166060015561.

It is not a de Polignac number, because 165510060661 - 2²⁵ = 165476506229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165510060661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165510060641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34572510 + ... + 34577296.

It is an arithmetic number, because the mean of its divisors is an integer number (7679856240).

Almost surely, 2^165510060661 is an apocalyptic number.

165510060661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165510060661 is a deficient number, since it is larger than the sum of its proper divisors (18806489099).

165510060661 is a wasteful number, since it uses less digits than its factorization.

165510060661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8505 (or 8494 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 165510060661 in words is "one hundred sixty-five billion, five hundred ten million, sixty thousand, six hundred sixty-one".