18884709497 has 4 divisors (see below), whose sum is σ = 18890331636. Its totient is φ = 18879087360.

The previous prime is 18884709449. The next prime is 18884709517. The reversal of 18884709497 is 79490748881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14704957696 + 4179751801 = 121264^2 + 64651^2 .

It is a cyclic number.

It is not a de Polignac number, because 18884709497 - 2¹⁰ = 18884708473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18884709407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2806028 + ... + 2812749.

It is an arithmetic number, because the mean of its divisors is an integer number (4722582909).

Almost surely, 2^18884709497 is an apocalyptic number.

It is an amenable number.

18884709497 is a deficient number, since it is larger than the sum of its proper divisors (5622139).

18884709497 is an equidigital number, since it uses as much as digits as its factorization.

18884709497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5622138.

The product of its (nonzero) digits is 32514048, while the sum is 65.

The spelling of 18884709497 in words is "eighteen billion, eight hundred eighty-four million, seven hundred nine thousand, four hundred ninety-seven".