66957971892 has 96 divisors (see below), whose sum is σ = 184700866560. Its totient is φ = 18479767680.

The previous prime is 66957971869. The next prime is 66957971903. The reversal of 66957971892 is 29817975966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354517 + ... + 509507.

It is an arithmetic number, because the mean of its divisors is an integer number (1923967360).

Almost surely, 2^66957971892 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66957971892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92350433280).

66957971892 is an abundant number, since it is smaller than the sum of its proper divisors (117742894668).

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

66957971892 is a wasteful number, since it uses less digits than its factorization.

66957971892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155181 (or 155179 counting only the distinct ones).

The product of its digits is 102876480, while the sum is 69.

The spelling of 66957971892 in words is "sixty-six billion, nine hundred fifty-seven million, nine hundred seventy-one thousand, eight hundred ninety-two".