18883850521 has 4 divisors (see below), whose sum is σ = 18950578192. Its totient is φ = 18817122852.

The previous prime is 18883850507. The next prime is 18883850537. The reversal of 18883850521 is 12505838881.

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 18883850521 - 2⁹ = 18883850009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18883851521) 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, 33363411 + ... + 33363976.

It is an arithmetic number, because the mean of its divisors is an integer number (4737644548).

Almost surely, 2^18883850521 is an apocalyptic number.

It is an amenable number.

18883850521 is a deficient number, since it is larger than the sum of its proper divisors (66727671).

18883850521 is an equidigital number, since it uses as much as digits as its factorization.

18883850521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66727670.

The product of its (nonzero) digits is 614400, while the sum is 49.

The spelling of 18883850521 in words is "eighteen billion, eight hundred eighty-three million, eight hundred fifty thousand, five hundred twenty-one".