149665 has 8 divisors (see below), whose sum is σ = 184680. Its totient is φ = 116352.

The previous prime is 149629. The next prime is 149689. The reversal of 149665 is 566941.

It can be written as a sum of positive squares in 4 ways, for example, as 71824 + 77841 = 268^2 + 279^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 149665 - 2⁹ = 149153 is a prime.

It is a super-2 number, since 2×149665² = 44799224450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220 + ... + 589.

It is an arithmetic number, because the mean of its divisors is an integer number (23085).

2¹⁴⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

149665 is a deficient number, since it is larger than the sum of its proper divisors (35015).

149665 is an equidigital number, since it uses as much as digits as its factorization.

149665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851.

The product of its digits is 6480, while the sum is 31.

The square root of 149665 is about 386.8656097406. The cubic root of 149665 is about 53.0933444630.

The spelling of 149665 in words is "one hundred forty-nine thousand, six hundred sixty-five".