2543684651 has 16 divisors (see below), whose sum is σ = 2632396800. Its totient is φ = 2456461728.

The previous prime is 2543684599. The next prime is 2543684659. The reversal of 2543684651 is 1564863452.

It is a cyclic number.

It is not a de Polignac number, because 2543684651 - 2¹⁰ = 2543683627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543684659) by changing a digit.

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, 2069105 + ... + 2070333.

It is an arithmetic number, because the mean of its divisors is an integer number (164524800).

Almost surely, 2^2543684651 is an apocalyptic number.

2543684651 is a deficient number, since it is larger than the sum of its proper divisors (88712149).

2543684651 is a wasteful number, since it uses less digits than its factorization.

2543684651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778.

The product of its digits is 691200, while the sum is 44.

The square root of 2543684651 is about 50434.9546544854. The cubic root of 2543684651 is about 1365.0684309595.

The spelling of 2543684651 in words is "two billion, five hundred forty-three million, six hundred eighty-four thousand, six hundred fifty-one".