18923857224337 has 8 divisors (see below), whose sum is σ = 20388097817640. Its totient is φ = 17460839383680.

The previous prime is 18923857224299. The next prime is 18923857224341. The reversal of 18923857224337 is 73342275832981.

It is a Cunningham number, because it is equal to 4350156²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 18923857224336 = 1^2 + 4350156^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18923857224337 - 2²³ = 18923848835729 is a prime.

It is a super-2 number, since 2×18923857224337² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18923857224397) 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 7 ways as a sum of consecutive naturals, for example, 305656012 + ... + 305717917.

It is an arithmetic number, because the mean of its divisors is an integer number (2548512227205).

Almost surely, 2^{18923857224337} is an apocalyptic number.

It is an amenable number.

18923857224337 is a deficient number, since it is larger than the sum of its proper divisors (1464240593303).

18923857224337 is a wasteful number, since it uses less digits than its factorization.

18923857224337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611376323.

The product of its digits is 121927680, while the sum is 64.

The spelling of 18923857224337 in words is "eighteen trillion, nine hundred twenty-three billion, eight hundred fifty-seven million, two hundred twenty-four thousand, three hundred thirty-seven".