665525015 has 8 divisors (see below), whose sum is σ = 812166480. Its totient is φ = 523395712.

The previous prime is 665525011. The next prime is 665525023. The reversal of 665525015 is 510525566.

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 665525015 - 2² = 665525011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665525011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1127714 + ... + 1128303.

It is an arithmetic number, because the mean of its divisors is an integer number (101520810).

Almost surely, 2^665525015 is an apocalyptic number.

665525015 is a deficient number, since it is larger than the sum of its proper divisors (146641465).

665525015 is a wasteful number, since it uses less digits than its factorization.

665525015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256081.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 665525015 is about 25797.7715122838. The cubic root of 665525015 is about 873.0815175191.

The spelling of 665525015 in words is "six hundred sixty-five million, five hundred twenty-five thousand, fifteen".