25839857198 has 4 divisors (see below), whose sum is σ = 38759785800. Its totient is φ = 12919928598.

The previous prime is 25839857189. The next prime is 25839857201. The reversal of 25839857198 is 89175893852.

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

It is a super-2 number, since 2×25839857198² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459964298 + ... + 6459964301.

It is an arithmetic number, because the mean of its divisors is an integer number (9689946450).

Almost surely, 2^25839857198 is an apocalyptic number.

25839857198 is a deficient number, since it is larger than the sum of its proper divisors (12919928602).

25839857198 is a wasteful number, since it uses less digits than its factorization.

25839857198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12919928601.

The product of its digits is 43545600, while the sum is 65.

The spelling of 25839857198 in words is "twenty-five billion, eight hundred thirty-nine million, eight hundred fifty-seven thousand, one hundred ninety-eight".