66785622338 has 18 divisors (see below), whose sum is σ = 102704447883. Its totient is φ = 32571042880.

The previous prime is 66785622329. The next prime is 66785622367. The reversal of 66785622338 is 83322658766.

It can be written as a sum of positive squares in 5 ways, for example, as 11582710129 + 55202912209 = 107623^2 + 234953^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=182737.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14982206 + ... + 14986662.

Almost surely, 2^66785622338 is an apocalyptic number.

66785622338 is a deficient number, since it is larger than the sum of its proper divisors (35918825545).

66785622338 is an frugal number, since it uses more digits than its factorization.

66785622338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8998 (or 4500 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 56.

The spelling of 66785622338 in words is "sixty-six billion, seven hundred eighty-five million, six hundred twenty-two thousand, three hundred thirty-eight".