25882779905 has 8 divisors (see below), whose sum is σ = 32886355752. Its totient is φ = 19488210688.

The previous prime is 25882779893. The next prime is 25882779919. The reversal of 25882779905 is 50997728852.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5505788401 + 20376991504 = 74201^2 + 142748^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25882779905 - 2¹⁶ = 25882714369 is a prime.

It is a super-2 number, since 2×25882779905² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152251562 + ... + 152251731.

It is an arithmetic number, because the mean of its divisors is an integer number (4110794469).

Almost surely, 2^25882779905 is an apocalyptic number.

It is an amenable number.

25882779905 is a deficient number, since it is larger than the sum of its proper divisors (7003575847).

25882779905 is a wasteful number, since it uses less digits than its factorization.

25882779905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304503315.

The product of its (nonzero) digits is 25401600, while the sum is 62.

The spelling of 25882779905 in words is "twenty-five billion, eight hundred eighty-two million, seven hundred seventy-nine thousand, nine hundred five".