165561354 has 64 divisors (see below), whose sum is σ = 429465600. Its totient is φ = 46291824.

The previous prime is 165561353. The next prime is 165561379. The reversal of 165561354 is 453165561.

165561354 is a `hidden beast` number, since 1 + 65 + 561 + 35 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (165561353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13107 + ... + 22425.

It is an arithmetic number, because the mean of its divisors is an integer number (6710400).

Almost surely, 2^165561354 is an apocalyptic number.

165561354 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 165561354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214732800).

165561354 is an abundant number, since it is smaller than the sum of its proper divisors (263904246).

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

165561354 is a wasteful number, since it uses less digits than its factorization.

165561354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384 (or 9378 counting only the distinct ones).

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

The square root of 165561354 is about 12867.0647002337. The cubic root of 165561354 is about 549.1019548472.

The spelling of 165561354 in words is "one hundred sixty-five million, five hundred sixty-one thousand, three hundred fifty-four".