66361679 has 4 divisors (see below), whose sum is σ = 66406776. Its totient is φ = 66316584.

The previous prime is 66361663. The next prime is 66361709. The reversal of 66361679 is 97616366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66361679 - 2⁴ = 66361663 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 (66361619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20264 + ... + 23309.

It is an arithmetic number, because the mean of its divisors is an integer number (16601694).

Almost surely, 2^66361679 is an apocalyptic number.

66361679 is a deficient number, since it is larger than the sum of its proper divisors (45097).

66361679 is a wasteful number, since it uses less digits than its factorization.

66361679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45096.

The product of its digits is 244944, while the sum is 44.

The square root of 66361679 is about 8146.2677957455. The cubic root of 66361679 is about 404.8608555177.

The spelling of 66361679 in words is "sixty-six million, three hundred sixty-one thousand, six hundred seventy-nine".