25195921771 has 2 divisors, whose sum is σ = 25195921772. Its totient is φ = 25195921770.

The previous prime is 25195921753. The next prime is 25195921837. The reversal of 25195921771 is 17712959152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25195921771 - 2¹³ = 25195913579 is a prime.

It is not a weakly prime, because it can be changed into another prime (25195921721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12597960885 + 12597960886.

It is an arithmetic number, because the mean of its divisors is an integer number (12597960886).

Almost surely, 2^25195921771 is an apocalyptic number.

25195921771 is a deficient number, since it is larger than the sum of its proper divisors (1).

25195921771 is an equidigital number, since it uses as much as digits as its factorization.

25195921771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 396900, while the sum is 49.

The spelling of 25195921771 in words is "twenty-five billion, one hundred ninety-five million, nine hundred twenty-one thousand, seven hundred seventy-one".