66512986893366 has 128 divisors (see below), whose sum is σ = 146665412812800. Its totient is φ = 19985170158720.

The previous prime is 66512986893341. The next prime is 66512986893373. The reversal of 66512986893366 is 66339868921566.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a junction number, because it is equal to n+sod(n) for n = 66512986893291 and 66512986893300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 408046261 + ... + 408209231.

It is an arithmetic number, because the mean of its divisors is an integer number (1145823537600).

Almost surely, 2^{66512986893366} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66512986893366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73332706406400).

66512986893366 is an abundant number, since it is smaller than the sum of its proper divisors (80152425919434).

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

66512986893366 is a wasteful number, since it uses less digits than its factorization.

66512986893366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163794.

The product of its digits is 3627970560, while the sum is 78.

The spelling of 66512986893366 in words is "sixty-six trillion, five hundred twelve billion, nine hundred eighty-six million, eight hundred ninety-three thousand, three hundred sixty-six".