19431066890 has 16 divisors (see below), whose sum is σ = 35921216232. Its totient is φ = 7562361024.

The previous prime is 19431066883. The next prime is 19431066943. The reversal of 19431066890 is 9866013491.

It can be written as a sum of positive squares in 4 ways, for example, as 19044276001 + 386790889 = 138001^2 + 19667^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26257829 + ... + 26258568.

Almost surely, 2^19431066890 is an apocalyptic number.

19431066890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19431066890 is a deficient number, since it is larger than the sum of its proper divisors (16490149342).

19431066890 is a wasteful number, since it uses less digits than its factorization.

19431066890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52516441.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 19431066890 in words is "nineteen billion, four hundred thirty-one million, sixty-six thousand, eight hundred ninety".