66733430940 has 72 divisors (see below), whose sum is σ = 220826996208. Its totient is φ = 16177800960.

The previous prime is 66733430921. The next prime is 66733430947. The reversal of 66733430940 is 4903433766.

66733430940 is a `hidden beast` number, since 6 + 6 + 7 + 334 + 309 + 4 + 0 = 666.

It is a super-3 number, since 3×66733430940³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66733430947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16849897 + ... + 16853856.

It is an arithmetic number, because the mean of its divisors is an integer number (3067041614).

Almost surely, 2^66733430940 is an apocalyptic number.

66733430940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66733430940 is an abundant number, since it is smaller than the sum of its proper divisors (154093565268).

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

66733430940 is a wasteful number, since it uses less digits than its factorization.

66733430940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33703779 (or 33703774 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 45.

The spelling of 66733430940 in words is "sixty-six billion, seven hundred thirty-three million, four hundred thirty thousand, nine hundred forty".