25865967242 has 4 divisors (see below), whose sum is σ = 38798950866. Its totient is φ = 12932983620.

The previous prime is 25865967229. The next prime is 25865967251. The reversal of 25865967242 is 24276956852.

It is a Cunningham number, because it is equal to 160829²+1.

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., 25865967241 + 1 = 160829^2 + 1^2 .

It is a super-2 number, since 2×25865967242² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6466491809 + ... + 6466491812.

Almost surely, 2^25865967242 is an apocalyptic number.

25865967242 is a deficient number, since it is larger than the sum of its proper divisors (12932983624).

25865967242 is a wasteful number, since it uses less digits than its factorization.

25865967242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12932983623.

The product of its digits is 14515200, while the sum is 56.

The spelling of 25865967242 in words is "twenty-five billion, eight hundred sixty-five million, nine hundred sixty-seven thousand, two hundred forty-two".