25049779858 has 4 divisors (see below), whose sum is σ = 37574669790. Its totient is φ = 12524889928.

The previous prime is 25049779789. The next prime is 25049779897. The reversal of 25049779858 is 85897794052.

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., 24648058009 + 401721849 = 156997^2 + 20043^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25049779858.

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, 6262444963 + ... + 6262444966.

Almost surely, 2^25049779858 is an apocalyptic number.

25049779858 is a deficient number, since it is larger than the sum of its proper divisors (12524889932).

25049779858 is a wasteful number, since it uses less digits than its factorization.

25049779858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12524889931.

The product of its (nonzero) digits is 50803200, while the sum is 64.

The spelling of 25049779858 in words is "twenty-five billion, forty-nine million, seven hundred seventy-nine thousand, eight hundred fifty-eight".