19968545490 has 64 divisors (see below), whose sum is σ = 51072270336. Its totient is φ = 4985047232.

The previous prime is 19968545489. The next prime is 19968545507. The reversal of 19968545490 is 9454586991.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275442 + ... + 340301.

It is an arithmetic number, because the mean of its divisors is an integer number (798004224).

Almost surely, 2^19968545490 is an apocalyptic number.

19968545490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19968545490 is an abundant number, since it is smaller than the sum of its proper divisors (31103724846).

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

19968545490 is a wasteful number, since it uses less digits than its factorization.

19968545490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615823.

The product of its (nonzero) digits is 13996800, while the sum is 60.

The spelling of 19968545490 in words is "nineteen billion, nine hundred sixty-eight million, five hundred forty-five thousand, four hundred ninety".