66849812847 has 6 divisors (see below), whose sum is σ = 96560840792. Its totient is φ = 44566541892.

The previous prime is 66849812839. The next prime is 66849812851. The reversal of 66849812847 is 74821894866.

66849812847 is a `hidden beast` number, since 6 + 68 + 498 + 1 + 2 + 84 + 7 = 666.

It is not a de Polignac number, because 66849812847 - 2³ = 66849812839 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 (66849812807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3713878483 + ... + 3713878500.

Almost surely, 2^66849812847 is an apocalyptic number.

66849812847 is a deficient number, since it is larger than the sum of its proper divisors (29711027945).

66849812847 is a wasteful number, since it uses less digits than its factorization.

66849812847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7427756989 (or 7427756986 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The spelling of 66849812847 in words is "sixty-six billion, eight hundred forty-nine million, eight hundred twelve thousand, eight hundred forty-seven".