66847426013 has 4 divisors (see below), whose sum is σ = 67040070240. Its totient is φ = 66654781788.

The previous prime is 66847425947. The next prime is 66847426043. The reversal of 66847426013 is 31062474866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66847426013 - 2¹² = 66847421917 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 (66847426043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96321593 + ... + 96322286.

It is an arithmetic number, because the mean of its divisors is an integer number (16760017560).

Almost surely, 2^66847426013 is an apocalyptic number.

It is an amenable number.

66847426013 is a deficient number, since it is larger than the sum of its proper divisors (192644227).

66847426013 is a wasteful number, since it uses less digits than its factorization.

66847426013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192644226.

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 66847426013 in words is "sixty-six billion, eight hundred forty-seven million, four hundred twenty-six thousand, thirteen".