165988738 has 8 divisors (see below), whose sum is σ = 251780940. Its totient is φ = 82061760.

The previous prime is 165988733. The next prime is 165988759. The reversal of 165988738 is 837889561.

It can be written as a sum of positive squares in 2 ways, for example, as 160098409 + 5890329 = 12653^2 + 2427^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×165988738² = 55104522285665288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165988733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466083 + ... + 466438.

Almost surely, 2^165988738 is an apocalyptic number.

165988738 is a deficient number, since it is larger than the sum of its proper divisors (85792202).

165988738 is an equidigital number, since it uses as much as digits as its factorization.

165988738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932612.

The product of its digits is 2903040, while the sum is 55.

The square root of 165988738 is about 12883.6616689511. The cubic root of 165988738 is about 549.5740371285.

The spelling of 165988738 in words is "one hundred sixty-five million, nine hundred eighty-eight thousand, seven hundred thirty-eight".