25661371 has 2 divisors, whose sum is σ = 25661372. Its totient is φ = 25661370.

The previous prime is 25661369. The next prime is 25661407. The reversal of 25661371 is 17316652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25661371 - 2¹ = 25661369 is a prime.

Together with 25661369, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25661341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12830685 + 12830686.

It is an arithmetic number, because the mean of its divisors is an integer number (12830686).

Almost surely, 2^25661371 is an apocalyptic number.

25661371 is a deficient number, since it is larger than the sum of its proper divisors (1).

25661371 is an equidigital number, since it uses as much as digits as its factorization.

25661371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 25661371 is about 5065.7053803000. The cubic root of 25661371 is about 294.9578451686.

The spelling of 25661371 in words is "twenty-five million, six hundred sixty-one thousand, three hundred seventy-one".