165620984 has 16 divisors (see below), whose sum is σ = 311831520. Its totient is φ = 82465920.

The previous prime is 165620981. The next prime is 165620989. The reversal of 165620984 is 489026561.

It is a happy number.

It is a super-2 number, since 2×165620984² = 54860620682256512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165620981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41024 + ... + 44879.

It is an arithmetic number, because the mean of its divisors is an integer number (19489470).

Almost surely, 2^165620984 is an apocalyptic number.

It is an amenable number.

165620984 is a deficient number, since it is larger than the sum of its proper divisors (146210536).

165620984 is a wasteful number, since it uses less digits than its factorization.

165620984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86150 (or 86146 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 165620984 is about 12869.3816479270. The cubic root of 165620984 is about 549.1678700272.

The spelling of 165620984 in words is "one hundred sixty-five million, six hundred twenty thousand, nine hundred eighty-four".