19764704569 has 3 divisors (see below), whose sum is σ = 19764845157. Its totient is φ = 19764563982.

The previous prime is 19764704567. The next prime is 19764704623. The reversal of 19764704569 is 96540746791.

The square root of 19764704569 is 140587.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96540746791 = 25261 ⋅3821731.

It is not a de Polignac number, because 19764704569 - 2¹ = 19764704567 is a prime.

It is a super-2 number, since 2×19764704569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19764704567) 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, 70294 + ... + 210880.

It is an arithmetic number, because the mean of its divisors is an integer number (6588281719).

Almost surely, 2^19764704569 is an apocalyptic number.

19764704569 is the 140587-th square number.

19764704569 is the 70294-th centered octagonal number.

It is an amenable number.

19764704569 is a deficient number, since it is larger than the sum of its proper divisors (140588).

19764704569 is an frugal number, since it uses more digits than its factorization.

19764704569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281174 (or 140587 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 58.

The spelling of 19764704569 in words is "nineteen billion, seven hundred sixty-four million, seven hundred four thousand, five hundred sixty-nine".