66427915 has 8 divisors (see below), whose sum is σ = 79825248. Its totient is φ = 53067840.

The previous prime is 66427901. The next prime is 66427919. The reversal of 66427915 is 51972466.

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

It is not a de Polignac number, because 66427915 - 2⁷ = 66427787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66427919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5226 + ... + 12655.

It is an arithmetic number, because the mean of its divisors is an integer number (9978156).

Almost surely, 2^66427915 is an apocalyptic number.

66427915 is a deficient number, since it is larger than the sum of its proper divisors (13397333).

66427915 is a wasteful number, since it uses less digits than its factorization.

66427915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18629.

The product of its digits is 90720, while the sum is 40.

The square root of 66427915 is about 8150.3322018185. The cubic root of 66427915 is about 404.9955087649.

The spelling of 66427915 in words is "sixty-six million, four hundred twenty-seven thousand, nine hundred fifteen".