165978063 has 12 divisors (see below), whose sum is σ = 239923320. Its totient is φ = 110570256.

The previous prime is 165978037. The next prime is 165978067. The reversal of 165978063 is 360879561.

It is a happy number.

It is not a de Polignac number, because 165978063 - 2⁵ = 165978031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165978067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7653 + ... + 19761.

It is an arithmetic number, because the mean of its divisors is an integer number (19993610).

Almost surely, 2^165978063 is an apocalyptic number.

165978063 is a deficient number, since it is larger than the sum of its proper divisors (73945257).

165978063 is a wasteful number, since it uses less digits than its factorization.

165978063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13638 (or 13635 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 165978063 is about 12883.2473778935. The cubic root of 165978063 is about 549.5622555488.

The spelling of 165978063 in words is "one hundred sixty-five million, nine hundred seventy-eight thousand, sixty-three".