66539699892 has 72 divisors (see below), whose sum is σ = 182761429760. Its totient is φ = 20334706560.

The previous prime is 66539699833. The next prime is 66539699899. The reversal of 66539699892 is 29899693566.

66539699892 is a `hidden beast` number, since 6 + 6 + 539 + 6 + 9 + 9 + 89 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66539699892.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66539699899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1547833 + ... + 1590240.

Almost surely, 2^66539699892 is an apocalyptic number.

66539699892 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

66539699892 is an abundant number, since it is smaller than the sum of its proper divisors (116221729868).

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

66539699892 is a wasteful number, since it uses less digits than its factorization.

66539699892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138133 (or 3138128 counting only the distinct ones).

The product of its digits is 340122240, while the sum is 72.

The spelling of 66539699892 in words is "sixty-six billion, five hundred thirty-nine million, six hundred ninety-nine thousand, eight hundred ninety-two".