165720830 has 16 divisors (see below), whose sum is σ = 325415664. Its totient is φ = 60262080.

The previous prime is 165720829. The next prime is 165720833. The reversal of 165720830 is 38027561.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165720833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753167 + ... + 753386.

It is an arithmetic number, because the mean of its divisors is an integer number (20338479).

Almost surely, 2^165720830 is an apocalyptic number.

165720830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165720830 is a deficient number, since it is larger than the sum of its proper divisors (159694834).

165720830 is a wasteful number, since it uses less digits than its factorization.

165720830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506571.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 165720830 is about 12873.2602708094. The cubic root of 165720830 is about 549.2782046777.

The spelling of 165720830 in words is "one hundred sixty-five million, seven hundred twenty thousand, eight hundred thirty".