66078831686 has 32 divisors (see below), whose sum is σ = 119249238528. Its totient is φ = 26848483200.

The previous prime is 66078831631. The next prime is 66078831697. The reversal of 66078831686 is 68613887066.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 871640 + ... + 944411.

It is an arithmetic number, because the mean of its divisors is an integer number (3726538704).

Almost surely, 2^66078831686 is an apocalyptic number.

66078831686 is a deficient number, since it is larger than the sum of its proper divisors (53170406842).

66078831686 is a wasteful number, since it uses less digits than its factorization.

66078831686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816196.

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 66078831686 in words is "sixty-six billion, seventy-eight million, eight hundred thirty-one thousand, six hundred eighty-six".