165618890 has 8 divisors (see below), whose sum is σ = 298114020. Its totient is φ = 66247552.

The previous prime is 165618881. The next prime is 165618899. The reversal of 165618890 is 98816561.

It is an interprime number because it is at equal distance from previous prime (165618881) and next prime (165618899).

It can be written as a sum of positive squares in 2 ways, for example, as 164891281 + 727609 = 12841^2 + 853^2 .

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

It is not an unprimeable number, because it can be changed into a prime (165618899) 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, 8280935 + ... + 8280954.

Almost surely, 2^165618890 is an apocalyptic number.

165618890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165618890 is a deficient number, since it is larger than the sum of its proper divisors (132495130).

165618890 is a wasteful number, since it uses less digits than its factorization.

165618890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16561896.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 165618890 is about 12869.3002917797. The cubic root of 165618890 is about 549.1655555815.

The spelling of 165618890 in words is "one hundred sixty-five million, six hundred eighteen thousand, eight hundred ninety".