165720834 has 12 divisors (see below), whose sum is σ = 359061846. Its totient is φ = 55240272.

The previous prime is 165720833. The next prime is 165720853. The reversal of 165720834 is 438027561.

165720834 is a `hidden beast` number, since 1 + 6 + 572 + 0 + 83 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 89245809 + 76475025 = 9447^2 + 8745^2 .

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

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4603339 + ... + 4603374.

Almost surely, 2^165720834 is an apocalyptic number.

165720834 is an abundant number, since it is smaller than the sum of its proper divisors (193341012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165720834 is a wasteful number, since it uses less digits than its factorization.

165720834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9206721 (or 9206718 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 165720834 is about 12873.2604261702. The cubic root of 165720834 is about 549.2782090970.

The spelling of 165720834 in words is "one hundred sixty-five million, seven hundred twenty thousand, eight hundred thirty-four".