25091458561 has 12 divisors (see below), whose sum is σ = 28106944380. Its totient is φ = 22362674880.

The previous prime is 25091458547. The next prime is 25091458631. The reversal of 25091458561 is 16585419052.

It can be written as a sum of positive squares in 6 ways, for example, as 6518947600 + 18572510961 = 80740^2 + 136281^2 .

It is not a de Polignac number, because 25091458561 - 2¹⁹ = 25090934273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25091428561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2554930 + ... + 2564731.

It is an arithmetic number, because the mean of its divisors is an integer number (2342245365).

Almost surely, 2^25091458561 is an apocalyptic number.

It is an amenable number.

25091458561 is a deficient number, since it is larger than the sum of its proper divisors (3015485819).

25091458561 is a wasteful number, since it uses less digits than its factorization.

25091458561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5119716 (or 5119703 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 25091458561 in words is "twenty-five billion, ninety-one million, four hundred fifty-eight thousand, five hundred sixty-one".