25193381879 has 4 divisors (see below), whose sum is σ = 25203722184. Its totient is φ = 25183041576.

The previous prime is 25193381861. The next prime is 25193381977. The reversal of 25193381879 is 97818339152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25193381879 - 2⁸ = 25193381623 is a prime.

It is a super-2 number, since 2×25193381879² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25193381779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5166497 + ... + 5171370.

It is an arithmetic number, because the mean of its divisors is an integer number (6300930546).

Almost surely, 2^25193381879 is an apocalyptic number.

25193381879 is a deficient number, since it is larger than the sum of its proper divisors (10340305).

25193381879 is a wasteful number, since it uses less digits than its factorization.

25193381879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10340304.

The product of its digits is 3265920, while the sum is 56.

The spelling of 25193381879 in words is "twenty-five billion, one hundred ninety-three million, three hundred eighty-one thousand, eight hundred seventy-nine".