25195921837 has 2 divisors, whose sum is σ = 25195921838. Its totient is φ = 25195921836.

The previous prime is 25195921771. The next prime is 25195921847. The reversal of 25195921837 is 73812959152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17692724196 + 7503197641 = 133014^2 + 86621^2 .

It is a cyclic number.

It is not a de Polignac number, because 25195921837 - 2²³ = 25187533229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25195921847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12597960918 + 12597960919.

It is an arithmetic number, because the mean of its divisors is an integer number (12597960919).

Almost surely, 2^25195921837 is an apocalyptic number.

It is an amenable number.

25195921837 is a deficient number, since it is larger than the sum of its proper divisors (1).

25195921837 is an equidigital number, since it uses as much as digits as its factorization.

25195921837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 52.

It can be divided in two parts, 2519 and 5921837, that added together give a square (5924356 = 2434²).

The spelling of 25195921837 in words is "twenty-five billion, one hundred ninety-five million, nine hundred twenty-one thousand, eight hundred thirty-seven".