66106865936690 has 24 divisors (see below), whose sum is σ = 125584733135340. Its totient is φ = 25051022879904.

The previous prime is 66106865936689. The next prime is 66106865936707. The reversal of 66106865936690 is 9663956860166.

66106865936690 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 53112189171721 + 12994676764969 = 7287811^2 + 3604813^2 .

It is a super-2 number, since 2×66106865936690² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9156072005 + ... + 9156079224.

Almost surely, 2^{66106865936690} is an apocalyptic number.

66106865936690 is a deficient number, since it is larger than the sum of its proper divisors (59477867198650).

66106865936690 is a wasteful number, since it uses less digits than its factorization.

66106865936690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18312151274 (or 18312151255 counting only the distinct ones).

The product of its (nonzero) digits is 453496320, while the sum is 71.

The spelling of 66106865936690 in words is "sixty-six trillion, one hundred six billion, eight hundred sixty-five million, nine hundred thirty-six thousand, six hundred ninety".