25543454461 has 6 divisors (see below), whose sum is σ = 29713814430. Its totient is φ = 21894389496.

The previous prime is 25543454459. The next prime is 25543454507. The reversal of 25543454461 is 16445434552.

It can be written as a sum of positive squares in only one way, i.e., 24713726436 + 829728025 = 157206^2 + 28805^2 .

It is not a de Polignac number, because 25543454461 - 2¹ = 25543454459 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 (25543454161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 260647446 + ... + 260647543.

It is an arithmetic number, because the mean of its divisors is an integer number (4952302405).

Almost surely, 2^25543454461 is an apocalyptic number.

It is an amenable number.

25543454461 is a deficient number, since it is larger than the sum of its proper divisors (4170359969).

25543454461 is an equidigital number, since it uses as much as digits as its factorization.

25543454461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521295003 (or 521294996 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 43.

The spelling of 25543454461 in words is "twenty-five billion, five hundred forty-three million, four hundred fifty-four thousand, four hundred sixty-one".