165864380 has 36 divisors (see below), whose sum is σ = 382864440. Its totient is φ = 60313440.

The previous prime is 165864367. The next prime is 165864389. The reversal of 165864380 is 83468561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165864389) 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, 31850 + ... + 36689.

Almost surely, 2^165864380 is an apocalyptic number.

165864380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165864380 is an abundant number, since it is smaller than the sum of its proper divisors (217000060).

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

165864380 is a wasteful number, since it uses less digits than its factorization.

165864380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68570 (or 68557 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 165864380 is about 12878.8345746034. The cubic root of 165864380 is about 549.4367567248.

The spelling of 165864380 in words is "one hundred sixty-five million, eight hundred sixty-four thousand, three hundred eighty".