2815663207820 has 24 divisors (see below), whose sum is σ = 5913767579328. Its totient is φ = 1126098646400.

The previous prime is 2815663207811. The next prime is 2815663207853. The reversal of 2815663207820 is 287023665182.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10276196 + ... + 10546635.

It is an arithmetic number, because the mean of its divisors is an integer number (246406982472).

Almost surely, 2^{2815663207820} is an apocalyptic number.

2815663207820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2815663207820 is an abundant number, since it is smaller than the sum of its proper divisors (3098104371508).

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

2815663207820 is a wasteful number, since it uses less digits than its factorization.

2815663207820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20829601 (or 20829599 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 2815663207820 in words is "two trillion, eight hundred fifteen billion, six hundred sixty-three million, two hundred seven thousand, eight hundred twenty".