165606651 has 24 divisors (see below), whose sum is σ = 273721344. Its totient is φ = 94515120.

The previous prime is 165606599. The next prime is 165606653. The reversal of 165606651 is 156606561.

It is not a de Polignac number, because 165606651 - 2⁶ = 165606587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165606653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91780 + ... + 93566.

It is an arithmetic number, because the mean of its divisors is an integer number (11405056).

Almost surely, 2^165606651 is an apocalyptic number.

165606651 is a deficient number, since it is larger than the sum of its proper divisors (108114693).

165606651 is a wasteful number, since it uses less digits than its factorization.

165606651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271 (or 3268 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 165606651 is about 12868.8247715166. The cubic root of 165606651 is about 549.1520277308.

The spelling of 165606651 in words is "one hundred sixty-five million, six hundred six thousand, six hundred fifty-one".