66710704440 has 32 divisors (see below), whose sum is σ = 200132113680. Its totient is φ = 17789521152.

The previous prime is 66710704429. The next prime is 66710704447. The reversal of 66710704440 is 4440701766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66710704447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277961149 + ... + 277961388.

Almost surely, 2^66710704440 is an apocalyptic number.

66710704440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66710704440 is an abundant number, since it is smaller than the sum of its proper divisors (133421409240).

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

66710704440 is a wasteful number, since it uses less digits than its factorization.

66710704440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555922551 (or 555922547 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 39.

The spelling of 66710704440 in words is "sixty-six billion, seven hundred ten million, seven hundred four thousand, four hundred forty".