66390247746 has 12 divisors (see below), whose sum is σ = 143845536822. Its totient is φ = 22130082576.

The previous prime is 66390247711. The next prime is 66390247831. The reversal of 66390247746 is 64774209366.

66390247746 is a `hidden beast` number, since 6 + 6 + 390 + 247 + 7 + 4 + 6 = 666.

66390247746 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 only one way, i.e., 38009791521 + 28380456225 = 194961^2 + 168465^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66390247692 and 66390247701.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1844173531 + ... + 1844173566.

Almost surely, 2^66390247746 is an apocalyptic number.

66390247746 is an abundant number, since it is smaller than the sum of its proper divisors (77455289076).

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

66390247746 is a wasteful number, since it uses less digits than its factorization.

66390247746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688347105 (or 3688347102 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 54.

The spelling of 66390247746 in words is "sixty-six billion, three hundred ninety million, two hundred forty-seven thousand, seven hundred forty-six".