66319879 has 4 divisors (see below), whose sum is σ = 69203376. Its totient is φ = 63436384.

The previous prime is 66319859. The next prime is 66319909. The reversal of 66319879 is 97891366.

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 66319879 - 2¹¹ = 66317831 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 (66319829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441714 + ... + 1441759.

It is an arithmetic number, because the mean of its divisors is an integer number (17300844).

Almost surely, 2^66319879 is an apocalyptic number.

66319879 is a deficient number, since it is larger than the sum of its proper divisors (2883497).

66319879 is a wasteful number, since it uses less digits than its factorization.

66319879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883496.

The product of its digits is 489888, while the sum is 49.

The square root of 66319879 is about 8143.7017995504. The cubic root of 66319879 is about 404.7758328637.

The spelling of 66319879 in words is "sixty-six million, three hundred nineteen thousand, eight hundred seventy-nine".