165715740 has 96 divisors (see below), whose sum is σ = 517527360. Its totient is φ = 44022528.

The previous prime is 165715733. The next prime is 165715763. The reversal of 165715740 is 47517561.

165715740 is a `hidden beast` number, since 16 + 5 + 71 + 574 + 0 = 666.

165715740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 165715695 and 165715704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213994 + ... + 214766.

It is an arithmetic number, because the mean of its divisors is an integer number (5390910).

Almost surely, 2^165715740 is an apocalyptic number.

165715740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165715740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258763680).

165715740 is an abundant number, since it is smaller than the sum of its proper divisors (351811620).

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

165715740 is a wasteful number, since it uses less digits than its factorization.

165715740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188 (or 1180 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 165715740 is about 12873.0625726748. The cubic root of 165715740 is about 549.2725810542.

The spelling of 165715740 in words is "one hundred sixty-five million, seven hundred fifteen thousand, seven hundred forty".