66440468280 has 64 divisors (see below), whose sum is σ = 211046199840. Its totient is φ = 16675254272.

The previous prime is 66440468261. The next prime is 66440468293. The reversal of 66440468280 is 8286404466.

66440468280 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 15 ways as a sum of consecutive naturals, for example, 16282389 + ... + 16286468.

Almost surely, 2^66440468280 is an apocalyptic number.

66440468280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66440468280 is an abundant number, since it is smaller than the sum of its proper divisors (144605731560).

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

66440468280 is a wasteful number, since it uses less digits than its factorization.

66440468280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32568888 (or 32568884 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 48.

The spelling of 66440468280 in words is "sixty-six billion, four hundred forty million, four hundred sixty-eight thousand, two hundred eighty".