165720622 has 16 divisors (see below), whose sum is σ = 264821760. Its totient is φ = 77551992.

The previous prime is 165720601. The next prime is 165720623. The reversal of 165720622 is 226027561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165720623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23118 + ... + 29425.

It is an arithmetic number, because the mean of its divisors is an integer number (16551360).

Almost surely, 2^165720622 is an apocalyptic number.

165720622 is a deficient number, since it is larger than the sum of its proper divisors (99101138).

165720622 is a wasteful number, since it uses less digits than its factorization.

165720622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52647.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 165720622 is about 12873.2521920453. The cubic root of 165720622 is about 549.2779748738.

The spelling of 165720622 in words is "one hundred sixty-five million, seven hundred twenty thousand, six hundred twenty-two".