66109479 has 4 divisors (see below), whose sum is σ = 88145976. Its totient is φ = 44072984.

The previous prime is 66109471. The next prime is 66109489. The reversal of 66109479 is 97490166.

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 66109479 - 2³ = 66109471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66109479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66109471) 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, 11018244 + ... + 11018249.

It is an arithmetic number, because the mean of its divisors is an integer number (22036494).

Almost surely, 2^66109479 is an apocalyptic number.

66109479 is a deficient number, since it is larger than the sum of its proper divisors (22036497).

66109479 is a wasteful number, since it uses less digits than its factorization.

66109479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22036496.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 66109479 is about 8130.7735794326. The cubic root of 66109479 is about 404.3473285827.

The spelling of 66109479 in words is "sixty-six million, one hundred nine thousand, four hundred seventy-nine".