66654031636 has 48 divisors (see below), whose sum is σ = 121226490000. Its totient is φ = 32028917760.

The previous prime is 66654031627. The next prime is 66654031679. The reversal of 66654031636 is 63613045666.

It can be written as a sum of positive squares in 8 ways, for example, as 8428341636 + 58225690000 = 91806^2 + 241300^2 .

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 15 ways as a sum of consecutive naturals, for example, 31131126 + ... + 31133266.

It is an arithmetic number, because the mean of its divisors is an integer number (2525551875).

Almost surely, 2^66654031636 is an apocalyptic number.

It is an amenable number.

66654031636 is a deficient number, since it is larger than the sum of its proper divisors (54572458364).

66654031636 is a wasteful number, since it uses less digits than its factorization.

66654031636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292 (or 3290 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 66654031636 in words is "sixty-six billion, six hundred fifty-four million, thirty-one thousand, six hundred thirty-six".