165630397 has 16 divisors (see below), whose sum is σ = 176463360. Its totient is φ = 155198848.

The previous prime is 165630349. The next prime is 165630449. The reversal of 165630397 is 793036561.

It is a cyclic number.

It is not a de Polignac number, because 165630397 - 2²⁷ = 31412669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165630307) 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, 186288 + ... + 187174.

It is an arithmetic number, because the mean of its divisors is an integer number (11028960).

Almost surely, 2^165630397 is an apocalyptic number.

It is an amenable number.

165630397 is a deficient number, since it is larger than the sum of its proper divisors (10832963).

165630397 is a wasteful number, since it uses less digits than its factorization.

165630397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 165630397 is about 12869.7473557176. The cubic root of 165630397 is about 549.1782737396.

The spelling of 165630397 in words is "one hundred sixty-five million, six hundred thirty thousand, three hundred ninety-seven".