25801216946 has 8 divisors (see below), whose sum is σ = 39136677660. Its totient is φ = 12755657728.

The previous prime is 25801216913. The next prime is 25801216949. The reversal of 25801216946 is 64961210852.

It can be written as a sum of positive squares in 2 ways, for example, as 21480126721 + 4321090225 = 146561^2 + 65735^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 25801216897 and 25801216906.

It is not an unprimeable number, because it can be changed into a prime (25801216949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72475151 + ... + 72475506.

Almost surely, 2^25801216946 is an apocalyptic number.

25801216946 is a deficient number, since it is larger than the sum of its proper divisors (13335460714).

25801216946 is a wasteful number, since it uses less digits than its factorization.

25801216946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144950748.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 25801216946 in words is "twenty-five billion, eight hundred one million, two hundred sixteen thousand, nine hundred forty-six".