25485561 has 6 divisors (see below), whose sum is σ = 36812490. Its totient is φ = 16990368.

The previous prime is 25485553. The next prime is 25485569. The reversal of 25485561 is 16558452.

25485561 is a `hidden beast` number, since 2 + 548 + 55 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (25485553) and next prime (25485569).

It can be written as a sum of positive squares in only one way, i.e., 24206400 + 1279161 = 4920^2 + 1131^2 .

It is not a de Polignac number, because 25485561 - 2³ = 25485553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25485569) 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, 1415856 + ... + 1415873.

It is an arithmetic number, because the mean of its divisors is an integer number (6135415).

Almost surely, 2^25485561 is an apocalyptic number.

It is an amenable number.

25485561 is a deficient number, since it is larger than the sum of its proper divisors (11326929).

25485561 is a wasteful number, since it uses less digits than its factorization.

25485561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831735 (or 2831732 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 25485561 is about 5048.3225927034. The cubic root of 25485561 is about 294.2827004503.

The spelling of 25485561 in words is "twenty-five million, four hundred eighty-five thousand, five hundred sixty-one".