66947239613 has 8 divisors (see below), whose sum is σ = 71025669120. Its totient is φ = 62924299200.

The previous prime is 66947239571. The next prime is 66947239621. The reversal of 66947239613 is 31693274966.

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 66947239613 - 2⁸ = 66947239357 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 (66947239663) 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, 13869788 + ... + 13874613.

It is an arithmetic number, because the mean of its divisors is an integer number (8878208640).

Almost surely, 2^66947239613 is an apocalyptic number.

It is an amenable number.

66947239613 is a deficient number, since it is larger than the sum of its proper divisors (4078429507).

66947239613 is a wasteful number, since it uses less digits than its factorization.

66947239613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27744547.

The product of its digits is 8817984, while the sum is 56.

The spelling of 66947239613 in words is "sixty-six billion, nine hundred forty-seven million, two hundred thirty-nine thousand, six hundred thirteen".