165556630 has 16 divisors (see below), whose sum is σ = 303625584. Its totient is φ = 64972960.

The previous prime is 165556613. The next prime is 165556663. The reversal of 165556630 is 36655561.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 165556630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155656 + ... + 156715.

It is an arithmetic number, because the mean of its divisors is an integer number (18976599).

Almost surely, 2^165556630 is an apocalyptic number.

165556630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165556630 is a deficient number, since it is larger than the sum of its proper divisors (138068954).

165556630 is a wasteful number, since it uses less digits than its factorization.

165556630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312431.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 165556630 is about 12866.8811294735. The cubic root of 165556630 is about 549.0967322470.

It can be divided in two parts, 1655 and 56630, that added together give a palindrome (58285).

The spelling of 165556630 in words is "one hundred sixty-five million, five hundred fifty-six thousand, six hundred thirty".