66666153559392 has 576 divisors, whose sum is σ = 202114150318080. Its totient is φ = 21605974442496.

The previous prime is 66666153559387. The next prime is 66666153559393. The reversal of 66666153559392 is 29395535166666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 66666153559392.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666153559393) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 41177363959 + ... + 41177365577.

It is an arithmetic number, because the mean of its divisors is an integer number (350892622080).

Almost surely, 2^{66666153559392} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66666153559392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101057075159040).

66666153559392 is an abundant number, since it is smaller than the sum of its proper divisors (135447996758688).

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

66666153559392 is a wasteful number, since it uses less digits than its factorization.

66666153559392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365 (or 2345 counting only the distinct ones).

The product of its digits is 1417176000, while the sum is 72.

The spelling of 66666153559392 in words is "sixty-six trillion, six hundred sixty-six billion, one hundred fifty-three million, five hundred fifty-nine thousand, three hundred ninety-two".