165639474 has 192 divisors, whose sum is σ = 500048640. Its totient is φ = 38223360.

The previous prime is 165639443. The next prime is 165639497. The reversal of 165639474 is 474936561.

165639474 is a `hidden beast` number, since 1 + 6 + 5 + 639 + 4 + 7 + 4 = 666.

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 522364 + ... + 522680.

It is an arithmetic number, because the mean of its divisors is an integer number (2604420).

Almost surely, 2^165639474 is an apocalyptic number.

165639474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165639474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250024320).

165639474 is an abundant number, since it is smaller than the sum of its proper divisors (334409166).

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

165639474 is a wasteful number, since it uses less digits than its factorization.

165639474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 382 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 165639474 is about 12870.0999996115. The cubic root of 165639474 is about 549.1883057148.

The spelling of 165639474 in words is "one hundred sixty-five million, six hundred thirty-nine thousand, four hundred seventy-four".