19949206128 has 40 divisors (see below), whose sum is σ = 51540637200. Its totient is φ = 6649065984.

The previous prime is 19949206127. The next prime is 19949206177. The reversal of 19949206128 is 82160294991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19949206127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 766188 + ... + 791796.

It is an arithmetic number, because the mean of its divisors is an integer number (1288515930).

Almost surely, 2^19949206128 is an apocalyptic number.

It is an amenable number.

19949206128 is an abundant number, since it is smaller than the sum of its proper divisors (31591431072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19949206128 is a wasteful number, since it uses less digits than its factorization.

19949206128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41849 (or 41843 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 51.

The spelling of 19949206128 in words is "nineteen billion, nine hundred forty-nine million, two hundred six thousand, one hundred twenty-eight".