66468312464 has 20 divisors (see below), whose sum is σ = 128896458060. Its totient is φ = 33204710400.

The previous prime is 66468312433. The next prime is 66468312479. The reversal of 66468312464 is 46421386466.

It can be written as a sum of positive squares in 2 ways, for example, as 9938494864 + 56529817600 = 99692^2 + 237760^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1821737 + ... + 1857864.

It is an arithmetic number, because the mean of its divisors is an integer number (6444822903).

Almost surely, 2^66468312464 is an apocalyptic number.

It is an amenable number.

66468312464 is a deficient number, since it is larger than the sum of its proper divisors (62428145596).

66468312464 is a wasteful number, since it uses less digits than its factorization.

66468312464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3680738 (or 3680732 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 50.

The spelling of 66468312464 in words is "sixty-six billion, four hundred sixty-eight million, three hundred twelve thousand, four hundred sixty-four".