66044985663 has 64 divisors (see below), whose sum is σ = 95900211200. Its totient is φ = 40299586560.

The previous prime is 66044985653. The next prime is 66044985673. The reversal of 66044985663 is 36658944066.

66044985663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66044985653) and next prime (66044985673).

It is not a de Polignac number, because 66044985663 - 2⁴ = 66044985647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66044985653) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 93151953 + ... + 93152661.

It is an arithmetic number, because the mean of its divisors is an integer number (1498440800).

Almost surely, 2^66044985663 is an apocalyptic number.

66044985663 is a deficient number, since it is larger than the sum of its proper divisors (29855225537).

66044985663 is a wasteful number, since it uses less digits than its factorization.

66044985663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its (nonzero) digits is 22394880, while the sum is 57.

The spelling of 66044985663 in words is "sixty-six billion, forty-four million, nine hundred eighty-five thousand, six hundred sixty-three".