66438363698 has 16 divisors (see below), whose sum is σ = 114299662464. Its totient is φ = 28372253280.

The previous prime is 66438363659. The next prime is 66438363703. The reversal of 66438363698 is 89636383466.

66438363698 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66438363698.

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, 8440190 + ... + 8448057.

It is an arithmetic number, because the mean of its divisors is an integer number (7143728904).

Almost surely, 2^66438363698 is an apocalyptic number.

66438363698 is a deficient number, since it is larger than the sum of its proper divisors (47861298766).

66438363698 is a wasteful number, since it uses less digits than its factorization.

66438363698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16888537.

The product of its digits is 80621568, while the sum is 62.

The spelling of 66438363698 in words is "sixty-six billion, four hundred thirty-eight million, three hundred sixty-three thousand, six hundred ninety-eight".