18521339353 has 4 divisors (see below), whose sum is σ = 20205097488. Its totient is φ = 16837581220.

The previous prime is 18521339341. The next prime is 18521339363. The reversal of 18521339353 is 35393312581.

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 18521339353 - 2²¹ = 18519242201 is a prime.

It is a super-2 number, since 2×18521339353² (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 (18521339323) 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, 841879051 + ... + 841879072.

It is an arithmetic number, because the mean of its divisors is an integer number (5051274372).

Almost surely, 2^18521339353 is an apocalyptic number.

It is an amenable number.

18521339353 is a deficient number, since it is larger than the sum of its proper divisors (1683758135).

18521339353 is a wasteful number, since it uses less digits than its factorization.

18521339353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683758134.

The product of its digits is 291600, while the sum is 43.

The spelling of 18521339353 in words is "eighteen billion, five hundred twenty-one million, three hundred thirty-nine thousand, three hundred fifty-three".