38165561 has 12 divisors (see below), whose sum is σ = 47009268. Its totient is φ = 30788352.

The previous prime is 38165549. The next prime is 38165563. The reversal of 38165561 is 16556183.

It can be written as a sum of positive squares in 2 ways, for example, as 31990336 + 6175225 = 5656^2 + 2485^2 .

It is not a de Polignac number, because 38165561 - 2⁶ = 38165497 is a prime.

It is a super-2 number, since 2×38165561² = 2913220092889442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38165563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22076 + ... + 23741.

It is an arithmetic number, because the mean of its divisors is an integer number (3917439).

Almost surely, 2^38165561 is an apocalyptic number.

It is an amenable number.

38165561 is a deficient number, since it is larger than the sum of its proper divisors (8843707).

38165561 is a wasteful number, since it uses less digits than its factorization.

38165561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45848 (or 45841 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 38165561 is about 6177.8281782516. The cubic root of 38165561 is about 336.6850894514.

The spelling of 38165561 in words is "thirty-eight million, one hundred sixty-five thousand, five hundred sixty-one".