19889490625 has 12 divisors (see below), whose sum is σ = 24860276028. Its totient is φ = 15911590000.

The previous prime is 19889490581. The next prime is 19889490713. The reversal of 19889490625 is 52609498891.

It can be written as a sum of positive squares in 6 ways, for example, as 17312506929 + 2576983696 = 131577^2 + 50764^2 .

It is not a de Polignac number, because 19889490625 - 2¹⁵ = 19889457857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3179194 + ... + 3185443.

It is an arithmetic number, because the mean of its divisors is an integer number (2071689669).

Almost surely, 2^19889490625 is an apocalyptic number.

It is an amenable number.

19889490625 is a deficient number, since it is larger than the sum of its proper divisors (4970785403).

19889490625 is an frugal number, since it uses more digits than its factorization.

19889490625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6364662 (or 6364642 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 61.

The spelling of 19889490625 in words is "nineteen billion, eight hundred eighty-nine million, four hundred ninety thousand, six hundred twenty-five".