25566049 has 2 divisors, whose sum is σ = 25566050. Its totient is φ = 25566048.

The previous prime is 25566031. The next prime is 25566053. The reversal of 25566049 is 94066552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25321024 + 245025 = 5032^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 25566049 - 2⁵ = 25566017 is a prime.

It is a super-2 number, since 2×25566049² = 1307245722940802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25565999 and 25566017.

It is not a weakly prime, because it can be changed into another prime (25566019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12783024 + 12783025.

It is an arithmetic number, because the mean of its divisors is an integer number (12783025).

Almost surely, 2^25566049 is an apocalyptic number.

It is an amenable number.

25566049 is a deficient number, since it is larger than the sum of its proper divisors (1).

25566049 is an equidigital number, since it uses as much as digits as its factorization.

25566049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 25566049 is about 5056.2880653697. The cubic root of 25566049 is about 294.5921741758.

The spelling of 25566049 in words is "twenty-five million, five hundred sixty-six thousand, forty-nine".