66188874645 has 12 divisors (see below), whose sum is σ = 114727382796. Its totient is φ = 35300733120.

The previous prime is 66188874629. The next prime is 66188874671. The reversal of 66188874645 is 54647888166.

66188874645 is a `hidden beast` number, since 6 + 618 + 8 + 8 + 7 + 4 + 6 + 4 + 5 = 666.

66188874645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13317390801 + 52871483844 = 115401^2 + 229938^2 .

It is not a de Polignac number, because 66188874645 - 2⁴ = 66188874629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 735431896 + ... + 735431985.

It is an arithmetic number, because the mean of its divisors is an integer number (9560615233).

Almost surely, 2^66188874645 is an apocalyptic number.

It is an amenable number.

66188874645 is a deficient number, since it is larger than the sum of its proper divisors (48538508151).

66188874645 is a wasteful number, since it uses less digits than its factorization.

66188874645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470863892 (or 1470863889 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 63.

The spelling of 66188874645 in words is "sixty-six billion, one hundred eighty-eight million, eight hundred seventy-four thousand, six hundred forty-five".