165903876061 has 24 divisors (see below), whose sum is σ = 222919200576. Its totient is φ = 121671285120.

The previous prime is 165903876059. The next prime is 165903876067. The reversal of 165903876061 is 160678309561.

It is a happy number.

It is not a de Polignac number, because 165903876061 - 2¹ = 165903876059 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 (165903876067) 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, 9043761 + ... + 9062086.

It is an arithmetic number, because the mean of its divisors is an integer number (9288300024).

Almost surely, 2^165903876061 is an apocalyptic number.

165903876061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165903876061 is a deficient number, since it is larger than the sum of its proper divisors (57015324515).

165903876061 is a wasteful number, since it uses less digits than its factorization.

165903876061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18105889 (or 18105882 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 165903876061 in words is "one hundred sixty-five billion, nine hundred three million, eight hundred seventy-six thousand, sixty-one".