25979943507458 has 4 divisors (see below), whose sum is σ = 38969915261190. Its totient is φ = 12989971753728.

The previous prime is 25979943507431. The next prime is 25979943507473. The reversal of 25979943507458 is 85470534997952.

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

It can be written as a sum of positive squares in only one way, i.e., 15061128671689 + 10918814835769 = 3880867^2 + 3304363^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6494985876863 + ... + 6494985876866.

Almost surely, 2^{25979943507458} is an apocalyptic number.

25979943507458 is a deficient number, since it is larger than the sum of its proper divisors (12989971753732).

25979943507458 is a wasteful number, since it uses less digits than its factorization.

25979943507458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12989971753731.

The product of its (nonzero) digits is 3429216000, while the sum is 77.

The spelling of 25979943507458 in words is "twenty-five trillion, nine hundred seventy-nine billion, nine hundred forty-three million, five hundred seven thousand, four hundred fifty-eight".