19698506890 has 12 divisors (see below), whose sum is σ = 35458111314. Its totient is φ = 7879225224.

The previous prime is 19698506887. The next prime is 19698507007. The reversal of 19698506890 is 9860589691.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17728656201 + 1969850689 = 133149^2 + 44383^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 421639 + ... + 466021.

Almost surely, 2^19698506890 is an apocalyptic number.

19698506890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19698506890 is a deficient number, since it is larger than the sum of its proper divisors (15759604424).

19698506890 is an frugal number, since it uses more digits than its factorization.

19698506890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88773 (or 44390 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 61.

The spelling of 19698506890 in words is "nineteen billion, six hundred ninety-eight million, five hundred six thousand, eight hundred ninety".