66278013726 has 16 divisors (see below), whose sum is σ = 132565547664. Its totient is φ = 22091084544.

The previous prime is 66278013691. The next prime is 66278013731. The reversal of 66278013726 is 62731087266.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304525 + ... + 474648.

It is an arithmetic number, because the mean of its divisors is an integer number (8285346729).

Almost surely, 2^66278013726 is an apocalyptic number.

66278013726 is an abundant number, since it is smaller than the sum of its proper divisors (66287533938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66278013726 is a wasteful number, since it uses less digits than its factorization.

66278013726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793355.

The product of its (nonzero) digits is 1016064, while the sum is 48.

The spelling of 66278013726 in words is "sixty-six billion, two hundred seventy-eight million, thirteen thousand, seven hundred twenty-six".