2545489209820 has 24 divisors (see below), whose sum is σ = 5345562799584. Its totient is φ = 1018188929856.

The previous prime is 2545489209793. The next prime is 2545489209821. The reversal of 2545489209820 is 289029845452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545489209821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3605649 + ... + 4253431.

It is an arithmetic number, because the mean of its divisors is an integer number (222731783316).

Almost surely, 2^{2545489209820} is an apocalyptic number.

2545489209820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2545489209820 is an abundant number, since it is smaller than the sum of its proper divisors (2800073589764).

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

2545489209820 is a wasteful number, since it uses less digits than its factorization.

2545489209820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844269 (or 844267 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 58.

The spelling of 2545489209820 in words is "two trillion, five hundred forty-five billion, four hundred eighty-nine million, two hundred nine thousand, eight hundred twenty".