66451773732 has 12 divisors (see below), whose sum is σ = 155054138736. Its totient is φ = 22150591240.

The previous prime is 66451773629. The next prime is 66451773749. The reversal of 66451773732 is 23737715466.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 2768823894 + ... + 2768823917.

It is an arithmetic number, because the mean of its divisors is an integer number (12921178228).

Almost surely, 2^66451773732 is an apocalyptic number.

It is an amenable number.

66451773732 is an abundant number, since it is smaller than the sum of its proper divisors (88602365004).

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

66451773732 is a wasteful number, since it uses less digits than its factorization.

66451773732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5537647818 (or 5537647816 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 51.

The spelling of 66451773732 in words is "sixty-six billion, four hundred fifty-one million, seven hundred seventy-three thousand, seven hundred thirty-two".