665925515 has 8 divisors (see below), whose sum is σ = 799352928. Its totient is φ = 532578880.

The previous prime is 665925503. The next prime is 665925541. The reversal of 665925515 is 515529566.

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

It is not a de Polignac number, because 665925515 - 2²⁴ = 649148299 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 266 + ... + 36495.

It is an arithmetic number, because the mean of its divisors is an integer number (99919116).

Almost surely, 2^665925515 is an apocalyptic number.

665925515 is a deficient number, since it is larger than the sum of its proper divisors (133427413).

665925515 is a wasteful number, since it uses less digits than its factorization.

665925515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40389.

The product of its digits is 405000, while the sum is 44.

The square root of 665925515 is about 25805.5326432143. The cubic root of 665925515 is about 873.2566168877.

The spelling of 665925515 in words is "six hundred sixty-five million, nine hundred twenty-five thousand, five hundred fifteen".