165977880 has 64 divisors (see below), whose sum is σ = 503560800. Its totient is φ = 43760640.

The previous prime is 165977857. The next prime is 165977891. The reversal of 165977880 is 88779561.

165977880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2910 + ... + 18450.

Almost surely, 2^165977880 is an apocalyptic number.

165977880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165977880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251780400).

165977880 is an abundant number, since it is smaller than the sum of its proper divisors (337582920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165977880 is a wasteful number, since it uses less digits than its factorization.

165977880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15644 (or 15640 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 51.

The square root of 165977880 is about 12883.2402756449. The cubic root of 165977880 is about 549.5620535745.

The spelling of 165977880 in words is "one hundred sixty-five million, nine hundred seventy-seven thousand, eight hundred eighty".