2545556636 has 48 divisors (see below), whose sum is σ = 5237331456. Its totient is φ = 1059718464.

The previous prime is 2545556621. The next prime is 2545556701. The reversal of 2545556636 is 6366555452.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 768095 + ... + 771401.

It is an arithmetic number, because the mean of its divisors is an integer number (109111072).

Almost surely, 2^2545556636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2545556636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2618665728).

2545556636 is an abundant number, since it is smaller than the sum of its proper divisors (2691774820).

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

2545556636 is a wasteful number, since it uses less digits than its factorization.

2545556636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4098 (or 4096 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 47.

The square root of 2545556636 is about 50453.5096499738. The cubic root of 2545556636 is about 1365.4032157786.

The spelling of 2545556636 in words is "two billion, five hundred forty-five million, five hundred fifty-six thousand, six hundred thirty-six".