25640510543 has 4 divisors (see below), whose sum is σ = 25640832360. Its totient is φ = 25640188728.

The previous prime is 25640510461. The next prime is 25640510563. The reversal of 25640510543 is 34501504652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25640510543 - 2¹² = 25640506447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640510563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56696 + ... + 233442.

It is an arithmetic number, because the mean of its divisors is an integer number (6410208090).

Almost surely, 2^25640510543 is an apocalyptic number.

25640510543 is a deficient number, since it is larger than the sum of its proper divisors (321817).

25640510543 is a wasteful number, since it uses less digits than its factorization.

25640510543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321816.

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 25640510543 in words is "twenty-five billion, six hundred forty million, five hundred ten thousand, five hundred forty-three".