25356535061 has 18 divisors (see below), whose sum is σ = 30180116610. Its totient is φ = 21278194080.

The previous prime is 25356535027. The next prime is 25356535067. The reversal of 25356535061 is 16053565352.

It can be written as a sum of positive squares in 3 ways, for example, as 21446161 + 25335088900 = 4631^2 + 159170^2 .

It is not a de Polignac number, because 25356535061 - 2²² = 25352340757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25356535067) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 599546 + ... + 640443.

It is an arithmetic number, because the mean of its divisors is an integer number (1676673145).

Almost surely, 2^25356535061 is an apocalyptic number.

It is an amenable number.

25356535061 is a deficient number, since it is larger than the sum of its proper divisors (4823581549).

25356535061 is a wasteful number, since it uses less digits than its factorization.

25356535061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240037 (or 1240013 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 41.

The spelling of 25356535061 in words is "twenty-five billion, three hundred fifty-six million, five hundred thirty-five thousand, sixty-one".