165616623 has 32 divisors (see below), whose sum is σ = 250145280. Its totient is φ = 108279360.

The previous prime is 165616621. The next prime is 165616667. The reversal of 165616623 is 326616561.

165616623 is a `hidden beast` number, since 16 + 5 + 6 + 16 + 623 = 666.

It is not a de Polignac number, because 165616623 - 2¹ = 165616621 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165616621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 589243 + ... + 589523.

It is an arithmetic number, because the mean of its divisors is an integer number (7817040).

Almost surely, 2^165616623 is an apocalyptic number.

165616623 is a deficient number, since it is larger than the sum of its proper divisors (84528657).

165616623 is a wasteful number, since it uses less digits than its factorization.

165616623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 630 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 165616623 is about 12869.2122136516. The cubic root of 165616623 is about 549.1630499011.

The spelling of 165616623 in words is "one hundred sixty-five million, six hundred sixteen thousand, six hundred twenty-three".