66336278540 has 48 divisors (see below), whose sum is σ = 160695021312. Its totient is φ = 22531302336.

The previous prime is 66336278509. The next prime is 66336278599. The reversal of 66336278540 is 4587263366.

66336278540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2199182 + ... + 2229141.

It is an arithmetic number, because the mean of its divisors is an integer number (3347812944).

Almost surely, 2^66336278540 is an apocalyptic number.

It is an amenable number.

66336278540 is an abundant number, since it is smaller than the sum of its proper divisors (94358742772).

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

66336278540 is a wasteful number, since it uses less digits than its factorization.

66336278540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428446 (or 4428444 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 66336278540 in words is "sixty-six billion, three hundred thirty-six million, two hundred seventy-eight thousand, five hundred forty".