165766398 has 32 divisors (see below), whose sum is σ = 384238080. Its totient is φ = 46693920.

The previous prime is 165766379. The next prime is 165766399. The reversal of 165766398 is 893667561.

It is a self number, because there is not a number n which added to its sum of digits gives 165766398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165766399) 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, 24813 + ... + 30776.

It is an arithmetic number, because the mean of its divisors is an integer number (12007440).

Almost surely, 2^165766398 is an apocalyptic number.

165766398 is an abundant number, since it is smaller than the sum of its proper divisors (218471682).

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

165766398 is a wasteful number, since it uses less digits than its factorization.

165766398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55672.

The product of its digits is 1632960, while the sum is 51.

The square root of 165766398 is about 12875.0300193825. The cubic root of 165766398 is about 549.3285447898.

The spelling of 165766398 in words is "one hundred sixty-five million, seven hundred sixty-six thousand, three hundred ninety-eight".