66312643798 has 16 divisors (see below), whose sum is σ = 103940148960. Its totient is φ = 31669995456.

The previous prime is 66312643783. The next prime is 66312643807. The reversal of 66312643798 is 89734621366.

66312643798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 984015 + ... + 1049242.

It is an arithmetic number, because the mean of its divisors is an integer number (6496259310).

Almost surely, 2^66312643798 is an apocalyptic number.

66312643798 is a deficient number, since it is larger than the sum of its proper divisors (37627505162).

66312643798 is a wasteful number, since it uses less digits than its factorization.

66312643798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033991.

The product of its digits is 7838208, while the sum is 55.

The spelling of 66312643798 in words is "sixty-six billion, three hundred twelve million, six hundred forty-three thousand, seven hundred ninety-eight".