66260406664 has 8 divisors (see below), whose sum is σ = 124238262510. Its totient is φ = 33130203328.

The previous prime is 66260406629. The next prime is 66260406671. The reversal of 66260406664 is 46660406266.

It can be written as a sum of positive squares in only one way, i.e., 39544504164 + 26715902500 = 198858^2 + 163450^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4141275409 + ... + 4141275424.

Almost surely, 2^66260406664 is an apocalyptic number.

It is an amenable number.

66260406664 is a deficient number, since it is larger than the sum of its proper divisors (57977855846).

66260406664 is a wasteful number, since it uses less digits than its factorization.

66260406664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8282550839 (or 8282550835 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 46.

The spelling of 66260406664 in words is "sixty-six billion, two hundred sixty million, four hundred six thousand, six hundred sixty-four".