180979865 has 16 divisors (see below), whose sum is σ = 245090880. Its totient is φ = 127081920.

The previous prime is 180979861. The next prime is 180979951. The reversal of 180979865 is 568979081.

It is not a de Polignac number, because 180979865 - 2² = 180979861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180979861) 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, 55139 + ... + 58328.

It is an arithmetic number, because the mean of its divisors is an integer number (15318180).

Almost surely, 2^180979865 is an apocalyptic number.

It is an amenable number.

180979865 is a deficient number, since it is larger than the sum of its proper divisors (64111015).

180979865 is a wasteful number, since it uses less digits than its factorization.

180979865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113512.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 180979865 is about 13452.8757148797. The cubic root of 180979865 is about 565.6443063524.

The spelling of 180979865 in words is "one hundred eighty million, nine hundred seventy-nine thousand, eight hundred sixty-five".