665136254 has 8 divisors (see below), whose sum is σ = 1056392928. Its totient is φ = 313005280.

The previous prime is 665136229. The next prime is 665136281. The reversal of 665136254 is 452631566.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9781382 + ... + 9781449.

It is an arithmetic number, because the mean of its divisors is an integer number (132049116).

Almost surely, 2^665136254 is an apocalyptic number.

665136254 is a deficient number, since it is larger than the sum of its proper divisors (391256674).

665136254 is a wasteful number, since it uses less digits than its factorization.

665136254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19562850.

The product of its digits is 129600, while the sum is 38.

The square root of 665136254 is about 25790.2356328902. The cubic root of 665136254 is about 872.9114832617.

The spelling of 665136254 in words is "six hundred sixty-five million, one hundred thirty-six thousand, two hundred fifty-four".