66512315 has 8 divisors (see below), whose sum is σ = 79925568. Its totient is φ = 53136000.

The previous prime is 66512311. The next prime is 66512323. The reversal of 66512315 is 51321566.

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

It is not a de Polignac number, because 66512315 - 2² = 66512311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66512311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5102 + ... + 12611.

It is an arithmetic number, because the mean of its divisors is an integer number (9990696).

Almost surely, 2^66512315 is an apocalyptic number.

66512315 is a deficient number, since it is larger than the sum of its proper divisors (13413253).

66512315 is a wasteful number, since it uses less digits than its factorization.

66512315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18469.

The product of its digits is 5400, while the sum is 29.

The square root of 66512315 is about 8155.5082612919. The cubic root of 66512315 is about 405.1669585470.

The spelling of 66512315 in words is "sixty-six million, five hundred twelve thousand, three hundred fifteen".