2543311656 has 128 divisors (see below), whose sum is σ = 7499606400. Its totient is φ = 795847680.

The previous prime is 2543311649. The next prime is 2543311663. The reversal of 2543311656 is 6561133452.

It is an interprime number because it is at equal distance from previous prime (2543311649) and next prime (2543311663).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2543311656.

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, 2096106 + ... + 2097318.

It is an arithmetic number, because the mean of its divisors is an integer number (58590675).

Almost surely, 2^2543311656 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 2543311656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3749803200).

2543311656 is an abundant number, since it is smaller than the sum of its proper divisors (4956294744).

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

2543311656 is a wasteful number, since it uses less digits than its factorization.

2543311656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816 (or 1806 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 2543311656 is about 50431.2567362742. The cubic root of 2543311656 is about 1365.0017051059.

The spelling of 2543311656 in words is "two billion, five hundred forty-three million, three hundred eleven thousand, six hundred fifty-six".