2865664521020 has 96 divisors (see below), whose sum is σ = 7064501918208. Its totient is φ = 955820259072.

The previous prime is 2865664520989. The next prime is 2865664521059. The reversal of 2865664521020 is 201254665682.

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, 39347159 + ... + 39419921.

It is an arithmetic number, because the mean of its divisors is an integer number (73588561648).

Almost surely, 2^{2865664521020} is an apocalyptic number.

2865664521020 is a gapful number since it is divisible by the number (20) 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 2865664521020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3532250959104).

2865664521020 is an abundant number, since it is smaller than the sum of its proper divisors (4198837397188).

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

2865664521020 is a wasteful number, since it uses less digits than its factorization.

2865664521020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80419 (or 80417 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 2865664521020 in words is "two trillion, eight hundred sixty-five billion, six hundred sixty-four million, five hundred twenty-one thousand, twenty".