66749385898 has 16 divisors (see below), whose sum is σ = 111544067880. Its totient is φ = 29745084096.

The previous prime is 66749385823. The next prime is 66749385971. The reversal of 66749385898 is 89858394766.

66749385898 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 4 ways, for example, as 27686630449 + 39062755449 = 166393^2 + 197643^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66749385898.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44262765 + ... + 44264272.

Almost surely, 2^66749385898 is an apocalyptic number.

66749385898 is a deficient number, since it is larger than the sum of its proper divisors (44794681982).

66749385898 is a wasteful number, since it uses less digits than its factorization.

66749385898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88527081.

The product of its digits is 627056640, while the sum is 73.

The spelling of 66749385898 in words is "sixty-six billion, seven hundred forty-nine million, three hundred eighty-five thousand, eight hundred ninety-eight".