66366815 has 8 divisors (see below), whose sum is σ = 82209408. Its totient is φ = 51380640.

The previous prime is 66366767. The next prime is 66366847. The reversal of 66366815 is 51866366.

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

It is not a de Polignac number, because 66366815 - 2¹⁰ = 66365791 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 213932 + ... + 214241.

It is an arithmetic number, because the mean of its divisors is an integer number (10276176).

Almost surely, 2^66366815 is an apocalyptic number.

66366815 is a deficient number, since it is larger than the sum of its proper divisors (15842593).

66366815 is a wasteful number, since it uses less digits than its factorization.

66366815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428209.

The product of its digits is 155520, while the sum is 41.

The square root of 66366815 is about 8146.5830260300. The cubic root of 66366815 is about 404.8712998571.

The spelling of 66366815 in words is "sixty-six million, three hundred sixty-six thousand, eight hundred fifteen".