25605967858 has 4 divisors (see below), whose sum is σ = 38408951790. Its totient is φ = 12802983928.

The previous prime is 25605967819. The next prime is 25605967897. The reversal of 25605967858 is 85876950652.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (25605967819) and next prime (25605967897).

It can be written as a sum of positive squares in only one way, i.e., 19028271249 + 6577696609 = 137943^2 + 81103^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25605967796 and 25605967805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6401491963 + ... + 6401491966.

Almost surely, 2^25605967858 is an apocalyptic number.

25605967858 is a deficient number, since it is larger than the sum of its proper divisors (12802983932).

25605967858 is a wasteful number, since it uses less digits than its factorization.

25605967858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12802983931.

The product of its (nonzero) digits is 36288000, while the sum is 61.

The spelling of 25605967858 in words is "twenty-five billion, six hundred five million, nine hundred sixty-seven thousand, eight hundred fifty-eight".