66802921692 has 24 divisors (see below), whose sum is σ = 167863752336. Its totient is φ = 20554745088.

The previous prime is 66802921681. The next prime is 66802921699. The reversal of 66802921692 is 29612920866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66802921699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214111773 + ... + 214112084.

It is an arithmetic number, because the mean of its divisors is an integer number (6994323014).

Almost surely, 2^66802921692 is an apocalyptic number.

It is an amenable number.

66802921692 is an abundant number, since it is smaller than the sum of its proper divisors (101060830644).

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

66802921692 is a wasteful number, since it uses less digits than its factorization.

66802921692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428223877 (or 428223875 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 66802921692 in words is "sixty-six billion, eight hundred two million, nine hundred twenty-one thousand, six hundred ninety-two".