66464228220 has 96 divisors (see below), whose sum is σ = 200714590272. Its totient is φ = 16335986688.

The previous prime is 66464228203. The next prime is 66464228267. The reversal of 66464228220 is 2282246466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 461634 + ... + 588246.

It is an arithmetic number, because the mean of its divisors is an integer number (2090776982).

Almost surely, 2^66464228220 is an apocalyptic number.

66464228220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66464228220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100357295136).

66464228220 is an abundant number, since it is smaller than the sum of its proper divisors (134250362052).

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

66464228220 is a wasteful number, since it uses less digits than its factorization.

66464228220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127311 (or 127309 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 42.

The spelling of 66464228220 in words is "sixty-six billion, four hundred sixty-four million, two hundred twenty-eight thousand, two hundred twenty".