66997275892 has 12 divisors (see below), whose sum is σ = 117247237380. Its totient is φ = 33498065216.

The previous prime is 66997275887. The next prime is 66997275899. The reversal of 66997275892 is 29857279966.

It can be written as a sum of positive squares in 2 ways, for example, as 19610081296 + 47387194596 = 140036^2 + 217686^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66997275899) 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, 225498 + ... + 429934.

It is an arithmetic number, because the mean of its divisors is an integer number (9770603115).

Almost surely, 2^66997275892 is an apocalyptic number.

It is an amenable number.

66997275892 is a deficient number, since it is larger than the sum of its proper divisors (50249961488).

66997275892 is a wasteful number, since it uses less digits than its factorization.

66997275892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286370 (or 286368 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 70.

The spelling of 66997275892 in words is "sixty-six billion, nine hundred ninety-seven million, two hundred seventy-five thousand, eight hundred ninety-two".