66847257492 has 12 divisors (see below), whose sum is σ = 155976934176. Its totient is φ = 22282419160.

The previous prime is 66847257473. The next prime is 66847257527. The reversal of 66847257492 is 29475274866.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785302384 + ... + 2785302407.

It is an arithmetic number, because the mean of its divisors is an integer number (12998077848).

Almost surely, 2^66847257492 is an apocalyptic number.

It is an amenable number.

66847257492 is an abundant number, since it is smaller than the sum of its proper divisors (89129676684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66847257492 is a wasteful number, since it uses less digits than its factorization.

66847257492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5570604798 (or 5570604796 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 60.

The spelling of 66847257492 in words is "sixty-six billion, eight hundred forty-seven million, two hundred fifty-seven thousand, four hundred ninety-two".