165557650 has 24 divisors (see below), whose sum is σ = 310197780. Its totient is φ = 65736960.

The previous prime is 165557591. The next prime is 165557677. The reversal of 165557650 is 56755561.

It can be written as a sum of positive squares in 6 ways, for example, as 117657409 + 47900241 = 10847^2 + 6921^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5235 + ... + 18934.

Almost surely, 2^165557650 is an apocalyptic number.

165557650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165557650 is a deficient number, since it is larger than the sum of its proper divisors (144640130).

165557650 is a wasteful number, since it uses less digits than its factorization.

165557650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24318 (or 24313 counting only the distinct ones).

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 165557650 is about 12866.9207660574. The cubic root of 165557650 is about 549.0978599125.

The spelling of 165557650 in words is "one hundred sixty-five million, five hundred fifty-seven thousand, six hundred fifty".