66552540216 has 64 divisors (see below), whose sum is σ = 171862763520. Its totient is φ = 21454277760.

The previous prime is 66552540193. The next prime is 66552540221. The reversal of 66552540216 is 61204525566.

It is a happy number.

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, 1119006 + ... + 1176978.

It is an arithmetic number, because the mean of its divisors is an integer number (2685355680).

Almost surely, 2^66552540216 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 66552540216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85931381760).

66552540216 is an abundant number, since it is smaller than the sum of its proper divisors (105310223304).

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

66552540216 is a wasteful number, since it uses less digits than its factorization.

66552540216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59556 (or 59552 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 66552540216 in words is "sixty-six billion, five hundred fifty-two million, five hundred forty thousand, two hundred sixteen".