66740407384 has 32 divisors (see below), whose sum is σ = 143031006720. Its totient is φ = 28599862176.

The previous prime is 66740407373. The next prime is 66740407397. The reversal of 66740407384 is 48370404766.

It is a happy number.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 484447 + ... + 606769.

It is an arithmetic number, because the mean of its divisors is an integer number (4469718960).

Almost surely, 2^66740407384 is an apocalyptic number.

It is an amenable number.

66740407384 is an abundant number, since it is smaller than the sum of its proper divisors (76290599336).

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

66740407384 is a wasteful number, since it uses less digits than its factorization.

66740407384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132079 (or 132075 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 49.

The spelling of 66740407384 in words is "sixty-six billion, seven hundred forty million, four hundred seven thousand, three hundred eighty-four".