19704579129 has 27 divisors (see below), whose sum is σ = 29572431343. Its totient is φ = 13128805944.

The previous prime is 19704579121. The next prime is 19704579157. The reversal of 19704579129 is 92197540791.

The square root of 19704579129 is 140373.

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

19704579129 is a `hidden beast` number, since 19 + 70 + 457 + 91 + 29 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8752538025 + 10952041104 = 93555^2 + 104652^2 .

It is a tau number, because it is divible by the number of its divisors (27).

It is not a de Polignac number, because 19704579129 - 2³ = 19704579121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19704579121) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11369347 + ... + 11371079.

Almost surely, 2^19704579129 is an apocalyptic number.

19704579129 is the 140373-rd square number.

19704579129 is the 70187-th centered octagonal number.

It is an amenable number.

19704579129 is a deficient number, since it is larger than the sum of its proper divisors (9867852214).

19704579129 is an frugal number, since it uses more digits than its factorization.

19704579129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490 (or 1736 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The spelling of 19704579129 in words is "nineteen billion, seven hundred four million, five hundred seventy-nine thousand, one hundred twenty-nine".