4821638791266 has 96 divisors (see below), whose sum is σ = 11442930512832. Its totient is φ = 1455168458880.

The previous prime is 4821638791261. The next prime is 4821638791273. The reversal of 4821638791266 is 6621978361284.

4821638791266 is a `hidden beast` number, since 48 + 216 + 38 + 7 + 91 + 266 = 666.

It is not an unprimeable number, because it can be changed into a prime (4821638791261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110533276 + ... + 110576888.

It is an arithmetic number, because the mean of its divisors is an integer number (119197192842).

Almost surely, 2^{4821638791266} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4821638791266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5721465256416).

4821638791266 is an abundant number, since it is smaller than the sum of its proper divisors (6621291721566).

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

4821638791266 is a wasteful number, since it uses less digits than its factorization.

4821638791266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45888 (or 45885 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 4821638791266 in words is "four trillion, eight hundred twenty-one billion, six hundred thirty-eight million, seven hundred ninety-one thousand, two hundred sixty-six".