153665994 has 16 divisors (see below), whose sum is σ = 308943360. Its totient is φ = 50953440.

The previous prime is 153665989. The next prime is 153665999. The reversal of 153665994 is 499566351.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (153665989) and next prime (153665999).

It is a super-2 number, since 2×153665994² = 47226475424016072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (153665999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65899 + ... + 68190.

It is an arithmetic number, because the mean of its divisors is an integer number (19308960).

Almost surely, 2^153665994 is an apocalyptic number.

153665994 is an abundant number, since it is smaller than the sum of its proper divisors (155277366).

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

153665994 is a wasteful number, since it uses less digits than its factorization.

153665994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134285.

The product of its digits is 874800, while the sum is 48.

The square root of 153665994 is about 12396.2088559366. The cubic root of 153665994 is about 535.6230479694.

The spelling of 153665994 in words is "one hundred fifty-three million, six hundred sixty-five thousand, nine hundred ninety-four".