66623444432666 has 96 divisors (see below), whose sum is σ = 117397958446080. Its totient is φ = 28112035910400.

The previous prime is 66623444432651. The next prime is 66623444432723.

66623444432666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66623444432599 and 66623444432608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 487647521 + ... + 487784123.

It is an arithmetic number, because the mean of its divisors is an integer number (1222895400480).

Almost surely, 2^{66623444432666} is an apocalyptic number.

66623444432666 is a deficient number, since it is larger than the sum of its proper divisors (50774514013414).

66623444432666 is a wasteful number, since it uses less digits than its factorization.

66623444432666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137700 (or 137683 counting only the distinct ones).

The product of its digits is 429981696, while the sum is 62.

The spelling of 66623444432666 in words is "sixty-six trillion, six hundred twenty-three billion, four hundred forty-four million, four hundred thirty-two thousand, six hundred sixty-six".