19855008025 has 6 divisors (see below), whose sum is σ = 24620209982. Its totient is φ = 15884006400.

The previous prime is 19855008007. The next prime is 19855008053. The reversal of 19855008025 is 52080055891.

It can be written as a sum of positive squares in 3 ways, for example, as 4887687744 + 14967320281 = 69912^2 + 122341^2 .

It is not a de Polignac number, because 19855008025 - 2²⁵ = 19821453593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 397100136 + ... + 397100185.

Almost surely, 2^19855008025 is an apocalyptic number.

It is an amenable number.

19855008025 is a deficient number, since it is larger than the sum of its proper divisors (4765201957).

19855008025 is an equidigital number, since it uses as much as digits as its factorization.

19855008025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794200331 (or 794200326 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 43.

The spelling of 19855008025 in words is "nineteen billion, eight hundred fifty-five million, eight thousand, twenty-five".