665121545 has 8 divisors (see below), whose sum is σ = 870704640. Its totient is φ = 483724720.

The previous prime is 665121511. The next prime is 665121559. The reversal of 665121545 is 545121566.

665121545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 665121545 - 2¹² = 665117449 is a prime.

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, 6046505 + ... + 6046614.

It is an arithmetic number, because the mean of its divisors is an integer number (108838080).

Almost surely, 2^665121545 is an apocalyptic number.

It is an amenable number.

665121545 is a deficient number, since it is larger than the sum of its proper divisors (205583095).

665121545 is a wasteful number, since it uses less digits than its factorization.

665121545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12093135.

The product of its digits is 36000, while the sum is 35.

The square root of 665121545 is about 25789.9504652491. The cubic root of 665121545 is about 872.9050486154.

The spelling of 665121545 in words is "six hundred sixty-five million, one hundred twenty-one thousand, five hundred forty-five".