19804649108 has 6 divisors (see below), whose sum is σ = 34658135946. Its totient is φ = 9902324552.

The previous prime is 19804649101. The next prime is 19804649129. The reversal of 19804649108 is 80194640891.

It can be written as a sum of positive squares in only one way, i.e., 17537175184 + 2267473924 = 132428^2 + 47618^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19804649101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2475581135 + ... + 2475581142.

It is an arithmetic number, because the mean of its divisors is an integer number (5776355991).

Almost surely, 2^19804649108 is an apocalyptic number.

It is an amenable number.

19804649108 is a deficient number, since it is larger than the sum of its proper divisors (14853486838).

19804649108 is a wasteful number, since it uses less digits than its factorization.

19804649108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4951162281 (or 4951162279 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 19804649108 in words is "nineteen billion, eight hundred four million, six hundred forty-nine thousand, one hundred eight".