17972809469 has 4 divisors (see below), whose sum is σ = 18011628096. Its totient is φ = 17933990844.

The previous prime is 17972809453. The next prime is 17972809483. The reversal of 17972809469 is 96490827971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 17972809469 - 2⁴ = 17972809453 is a prime.

It is a super-2 number, since 2×17972809469² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17972809069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19408619 + ... + 19409544.

It is an arithmetic number, because the mean of its divisors is an integer number (4502907024).

Almost surely, 2^17972809469 is an apocalyptic number.

It is an amenable number.

17972809469 is a deficient number, since it is larger than the sum of its proper divisors (38818627).

17972809469 is an equidigital number, since it uses as much as digits as its factorization.

17972809469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38818626.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 17972809469 in words is "seventeen billion, nine hundred seventy-two million, eight hundred nine thousand, four hundred sixty-nine".