66319913 has 8 divisors (see below), whose sum is σ = 72411456. Its totient is φ = 60238800.

The previous prime is 66319909. The next prime is 66319931. The reversal of 66319913 is 31991366.

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 66319913 - 2² = 66319909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66319963) 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 7 ways as a sum of consecutive naturals, for example, 17420 + ... + 20882.

It is an arithmetic number, because the mean of its divisors is an integer number (9051432).

Almost surely, 2^66319913 is an apocalyptic number.

It is an amenable number.

66319913 is a deficient number, since it is larger than the sum of its proper divisors (6091543).

66319913 is a wasteful number, since it uses less digits than its factorization.

66319913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5215.

The product of its digits is 26244, while the sum is 38.

The square root of 66319913 is about 8143.7038870529. The cubic root of 66319913 is about 404.7759020354.

The spelling of 66319913 in words is "sixty-six million, three hundred nineteen thousand, nine hundred thirteen".