66647738913 has 12 divisors (see below), whose sum is σ = 103372003440. Its totient is φ = 38084422152.

The previous prime is 66647738879. The next prime is 66647738959. The reversal of 66647738913 is 31983774666.

It is a happy number.

It is not a de Polignac number, because 66647738913 - 2¹⁰ = 66647737889 is a prime.

It is a super-2 number, since 2×66647738913² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66647738513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226692843 + ... + 226693136.

It is an arithmetic number, because the mean of its divisors is an integer number (8614333620).

Almost surely, 2^66647738913 is an apocalyptic number.

It is an amenable number.

66647738913 is a deficient number, since it is larger than the sum of its proper divisors (36724264527).

66647738913 is a wasteful number, since it uses less digits than its factorization.

66647738913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453385996 (or 453385989 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 60.

The spelling of 66647738913 in words is "sixty-six billion, six hundred forty-seven million, seven hundred thirty-eight thousand, nine hundred thirteen".