66107919 has 8 divisors (see below), whose sum is σ = 88228912. Its totient is φ = 44029440.

The previous prime is 66107893. The next prime is 66107927. The reversal of 66107919 is 91970166.

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

It is not a de Polignac number, because 66107919 - 2¹² = 66103823 is a prime.

It is a super-2 number, since 2×66107919² = 8740513909021122, 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 (66107219) 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, 6802 + ... + 13359.

It is an arithmetic number, because the mean of its divisors is an integer number (11028614).

Almost surely, 2^66107919 is an apocalyptic number.

66107919 is a deficient number, since it is larger than the sum of its proper divisors (22120993).

66107919 is a wasteful number, since it uses less digits than its factorization.

66107919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21257.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 66107919 is about 8130.6776470353. The cubic root of 66107919 is about 404.3441480666.

The spelling of 66107919 in words is "sixty-six million, one hundred seven thousand, nine hundred nineteen".