66672079 has 8 divisors (see below), whose sum is σ = 71152128. Its totient is φ = 62254080.

The previous prime is 66672071. The next prime is 66672119. The reversal of 66672079 is 97027666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66672079 - 2³ = 66672071 is a prime.

It is a super-2 number, since 2×66672079² = 8890332236364482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66672071) 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, 13282 + ... + 17599.

It is an arithmetic number, because the mean of its divisors is an integer number (8894016).

Almost surely, 2^66672079 is an apocalyptic number.

66672079 is a deficient number, since it is larger than the sum of its proper divisors (4480049).

66672079 is a wasteful number, since it uses less digits than its factorization.

66672079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31025.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 66672079 is about 8165.2972389252. The cubic root of 66672079 is about 405.4911057095.

The spelling of 66672079 in words is "sixty-six million, six hundred seventy-two thousand, seventy-nine".