66551215392 has 288 divisors, whose sum is σ = 211775316480. Its totient is φ = 19715604480.

The previous prime is 66551215387. The next prime is 66551215439. The reversal of 66551215392 is 29351215566.

66551215392 is a `hidden beast` number, since 6 + 6 + 551 + 2 + 1 + 5 + 3 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8892292 + ... + 8899772.

It is an arithmetic number, because the mean of its divisors is an integer number (735330960).

Almost surely, 2^66551215392 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 66551215392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105887658240).

66551215392 is an abundant number, since it is smaller than the sum of its proper divisors (145224101088).

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

66551215392 is a wasteful number, since it uses less digits than its factorization.

66551215392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7616 (or 7605 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

The spelling of 66551215392 in words is "sixty-six billion, five hundred fifty-one million, two hundred fifteen thousand, three hundred ninety-two".