66773215 has 8 divisors (see below), whose sum is σ = 82082448. Its totient is φ = 52115520.

The previous prime is 66773207. The next prime is 66773219. The reversal of 66773215 is 51237766.

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

It is not a de Polignac number, because 66773215 - 2³ = 66773207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66773219) 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, 162657 + ... + 163066.

It is an arithmetic number, because the mean of its divisors is an integer number (10260306).

Almost surely, 2^66773215 is an apocalyptic number.

66773215 is a deficient number, since it is larger than the sum of its proper divisors (15309233).

66773215 is a wasteful number, since it uses less digits than its factorization.

66773215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325769.

The product of its digits is 52920, while the sum is 37.

The square root of 66773215 is about 8171.4879306036. The cubic root of 66773215 is about 405.6960342214.

The spelling of 66773215 in words is "sixty-six million, seven hundred seventy-three thousand, two hundred fifteen".