66086604240020 has 144 divisors (see below), whose sum is σ = 174245833011600. Its totient is φ = 20868737089536.

The previous prime is 66086604240017. The next prime is 66086604240067. The reversal of 66086604240020 is 2004240668066.

It can be written as a sum of positive squares in 8 ways, for example, as 1597706112016 + 64488898128004 = 1264004^2 + 8030498^2 .

It is a congruent number.

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, 56279 + ... + 11496798.

It is an arithmetic number, because the mean of its divisors is an integer number (1210040507025).

Almost surely, 2^{66086604240020} 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 66086604240020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87122916505800).

66086604240020 is an abundant number, since it is smaller than the sum of its proper divisors (108159228771580).

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

66086604240020 is a wasteful number, since it uses less digits than its factorization.

66086604240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11553562 (or 11553553 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 44.

The spelling of 66086604240020 in words is "sixty-six trillion, eighty-six billion, six hundred four million, two hundred forty thousand, twenty".