66964747185 has 192 divisors, whose sum is σ = 142274396160. Its totient is φ = 28491678720.

The previous prime is 66964747183. The next prime is 66964747219. The reversal of 66964747185 is 58174746966.

It is a happy number.

66964747185 is a `hidden beast` number, since 6 + 6 + 96 + 474 + 71 + 8 + 5 = 666.

It is not a de Polignac number, because 66964747185 - 2¹ = 66964747183 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (66964747183) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 27077109 + ... + 27079581.

It is an arithmetic number, because the mean of its divisors is an integer number (741012480).

Almost surely, 2^66964747185 is an apocalyptic number.

It is an amenable number.

66964747185 is an abundant number, since it is smaller than the sum of its proper divisors (75309648975).

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

66964747185 is a wasteful number, since it uses less digits than its factorization.

66964747185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628 (or 2625 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 66964747185 in words is "sixty-six billion, nine hundred sixty-four million, seven hundred forty-seven thousand, one hundred eighty-five".