25575551 has 2 divisors, whose sum is σ = 25575552. Its totient is φ = 25575550.

The previous prime is 25575541. The next prime is 25575553. The reversal of 25575551 is 15557552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25575551 is a prime.

Together with 25575553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25575553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12787775 + 12787776.

It is an arithmetic number, because the mean of its divisors is an integer number (12787776).

Almost surely, 2^25575551 is an apocalyptic number.

25575551 is a deficient number, since it is larger than the sum of its proper divisors (1).

25575551 is an equidigital number, since it uses as much as digits as its factorization.

25575551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43750, while the sum is 35.

The square root of 25575551 is about 5057.2276001778. The cubic root of 25575551 is about 294.6286661672.

The spelling of 25575551 in words is "twenty-five million, five hundred seventy-five thousand, five hundred fifty-one".