66661843932 has 18 divisors (see below), whose sum is σ = 168506327808. Its totient is φ = 22220614632.

The previous prime is 66661843921. The next prime is 66661843991. The reversal of 66661843932 is 23934816666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 925858908 + ... + 925858979.

It is an arithmetic number, because the mean of its divisors is an integer number (9361462656).

Almost surely, 2^66661843932 is an apocalyptic number.

It is an amenable number.

66661843932 is an abundant number, since it is smaller than the sum of its proper divisors (101844483876).

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

66661843932 is a wasteful number, since it uses less digits than its factorization.

66661843932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851717897 (or 1851717892 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 54.

The spelling of 66661843932 in words is "sixty-six billion, six hundred sixty-one million, eight hundred forty-three thousand, nine hundred thirty-two".