19688860489 has 3 divisors (see below), whose sum is σ = 19689000807. Its totient is φ = 19688720172.

The previous prime is 19688860487. The next prime is 19688860493. The reversal of 19688860489 is 98406888691.

The square root of 19688860489 is 140317.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 19442119225 + 246741264 = 139435^2 + 15708^2 .

It is not a de Polignac number, because 19688860489 - 2¹ = 19688860487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19688860487) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 70159 + ... + 210475.

It is an arithmetic number, because the mean of its divisors is an integer number (6563000269).

Almost surely, 2^19688860489 is an apocalyptic number.

19688860489 is the 140317-th square number.

19688860489 is the 70159-th centered octagonal number.

It is an amenable number.

19688860489 is a deficient number, since it is larger than the sum of its proper divisors (140318).

19688860489 is an frugal number, since it uses more digits than its factorization.

19688860489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280634 (or 140317 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 67.

The spelling of 19688860489 in words is "nineteen billion, six hundred eighty-eight million, eight hundred sixty thousand, four hundred eighty-nine".