25195366642 has 8 divisors (see below), whose sum is σ = 37867301100. Its totient is φ = 12572932944.

The previous prime is 25195366631. The next prime is 25195366673. The reversal of 25195366642 is 24666359152.

It can be written as a sum of positive squares in 2 ways, for example, as 20624119321 + 4571247321 = 143611^2 + 67611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12373917 + ... + 12375952.

Almost surely, 2^25195366642 is an apocalyptic number.

25195366642 is a deficient number, since it is larger than the sum of its proper divisors (12671934458).

25195366642 is a wasteful number, since it uses less digits than its factorization.

25195366642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24750380.

The product of its digits is 2332800, while the sum is 49.

The spelling of 25195366642 in words is "twenty-five billion, one hundred ninety-five million, three hundred sixty-six thousand, six hundred forty-two".