165566415 has 32 divisors (see below), whose sum is σ = 303713280. Its totient is φ = 75446784.

The previous prime is 165566413. The next prime is 165566419. The reversal of 165566415 is 514665561.

It is not a de Polignac number, because 165566415 - 2¹ = 165566413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165566413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33046 + ... + 37724.

It is an arithmetic number, because the mean of its divisors is an integer number (9491040).

Almost surely, 2^165566415 is an apocalyptic number.

165566415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165566415 is a deficient number, since it is larger than the sum of its proper divisors (138146865).

165566415 is a wasteful number, since it uses less digits than its factorization.

165566415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5031.

The product of its digits is 108000, while the sum is 39.

The square root of 165566415 is about 12867.2613636313. The cubic root of 165566415 is about 549.1075499063.

It can be divided in two parts, 165 and 566415, that added together give a triangular number (566580 = T₁₀₆₄).

The spelling of 165566415 in words is "one hundred sixty-five million, five hundred sixty-six thousand, four hundred fifteen".