165345615 has 48 divisors (see below), whose sum is σ = 293480928. Its totient is φ = 86093568.

The previous prime is 165345613. The next prime is 165345623. The reversal of 165345615 is 516543561.

165345615 is a `hidden beast` number, since 1 + 6 + 5 + 34 + 5 + 615 = 666.

It is not a de Polignac number, because 165345615 - 2¹ = 165345613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165345615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165345613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 521437 + ... + 521753.

It is an arithmetic number, because the mean of its divisors is an integer number (6114186).

Almost surely, 2^165345615 is an apocalyptic number.

165345615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165345615 is a deficient number, since it is larger than the sum of its proper divisors (128135313).

165345615 is a wasteful number, since it uses less digits than its factorization.

165345615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 565 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 165345615 is about 12858.6785868533. The cubic root of 165345615 is about 548.8633440113.

It can be divided in two parts, 1653456 and 15, that added together give a triangular number (1653471 = T₁₈₁₈).

The spelling of 165345615 in words is "one hundred sixty-five million, three hundred forty-five thousand, six hundred fifteen".