19709632881 has 45 divisors (see below), whose sum is σ = 31111859163. Its totient is φ = 12433026960.

The previous prime is 19709632871. The next prime is 19709632937. The reversal of 19709632881 is 18823690791.

The square root of 19709632881 is 140391.

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

It can be written as a sum of positive squares in only one way, i.e., 5381542881 + 14328090000 = 73359^2 + 119700^2 .

It is not a de Polignac number, because 19709632881 - 2⁷ = 19709632753 is a prime.

It is a super-2 number, since 2×19709632881² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19709632801) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 24006451 + ... + 24007271.

Almost surely, 2^19709632881 is an apocalyptic number.

19709632881 is the 140391-st square number.

19709632881 is the 70196-th centered octagonal number.

It is an amenable number.

19709632881 is a deficient number, since it is larger than the sum of its proper divisors (11402226282).

19709632881 is an frugal number, since it uses more digits than its factorization.

19709632881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 19709632881 in words is "nineteen billion, seven hundred nine million, six hundred thirty-two thousand, eight hundred eighty-one".