66304641636 has 96 divisors (see below), whose sum is σ = 173976768000. Its totient is φ = 21835777824.

The previous prime is 66304641631. The next prime is 66304641671. The reversal of 66304641636 is 63614640366.

66304641636 is a `hidden beast` number, since 6 + 6 + 3 + 0 + 4 + 6 + 4 + 1 + 636 = 666.

It is a super-3 number, since 3×66304641636³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66304641591 and 66304641600.

It is not an unprimeable number, because it can be changed into a prime (66304641631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4372155 + ... + 4387293.

It is an arithmetic number, because the mean of its divisors is an integer number (1812258000).

Almost surely, 2^66304641636 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 66304641636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86988384000).

66304641636 is an abundant number, since it is smaller than the sum of its proper divisors (107672126364).

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

66304641636 is a wasteful number, since it uses less digits than its factorization.

66304641636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15638 (or 15630 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 45.

The spelling of 66304641636 in words is "sixty-six billion, three hundred four million, six hundred forty-one thousand, six hundred thirty-six".