2543642649125 has 16 divisors (see below), whose sum is σ = 3260262411120. Its totient is φ = 1979916436800.

The previous prime is 2543642649109. The next prime is 2543642649193. The reversal of 2543642649125 is 5219462463452.

It can be written as a sum of positive squares in 8 ways, for example, as 12533474209 + 2531109174916 = 111953^2 + 1590946^2 .

It is not a de Polignac number, because 2543642649125 - 2⁴ = 2543642649109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274983770 + ... + 274993019.

It is an arithmetic number, because the mean of its divisors is an integer number (203766400695).

Almost surely, 2^{2543642649125} is an apocalyptic number.

2543642649125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2543642649125 is a deficient number, since it is larger than the sum of its proper divisors (716619761995).

2543642649125 is an equidigital number, since it uses as much as digits as its factorization.

2543642649125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549976841 (or 549976831 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 53.

The spelling of 2543642649125 in words is "two trillion, five hundred forty-three billion, six hundred forty-two million, six hundred forty-nine thousand, one hundred twenty-five".