25557011 has 2 divisors, whose sum is σ = 25557012. Its totient is φ = 25557010.

The previous prime is 25556969. The next prime is 25557013. The reversal of 25557011 is 11075552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25557011 is a prime.

It is a super-2 number, since 2×25557011² = 1306321622508242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 25557013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25557013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12778505 + 12778506.

It is an arithmetic number, because the mean of its divisors is an integer number (12778506).

Almost surely, 2^25557011 is an apocalyptic number.

25557011 is a deficient number, since it is larger than the sum of its proper divisors (1).

25557011 is an equidigital number, since it uses as much as digits as its factorization.

25557011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 25557011 is about 5055.3942477318. The cubic root of 25557011 is about 294.5574557636.

It can be divided in two parts, 2555 and 7011, that multiplied together give a triangular number (17913105 = T₅₉₈₅).

The spelling of 25557011 in words is "twenty-five million, five hundred fifty-seven thousand, eleven".