18521019519 has 8 divisors (see below), whose sum is σ = 25994413440. Its totient is φ = 11697485976.

The previous prime is 18521019511. The next prime is 18521019523. The reversal of 18521019519 is 91591012581.

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

It is not a de Polignac number, because 18521019519 - 2³ = 18521019511 is a prime.

It is a super-2 number, since 2×18521019519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18521019511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162465027 + ... + 162465140.

It is an arithmetic number, because the mean of its divisors is an integer number (3249301680).

Almost surely, 2^18521019519 is an apocalyptic number.

18521019519 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18521019519 is a deficient number, since it is larger than the sum of its proper divisors (7473393921).

18521019519 is a wasteful number, since it uses less digits than its factorization.

18521019519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324930189.

The product of its (nonzero) digits is 32400, while the sum is 42.

The spelling of 18521019519 in words is "eighteen billion, five hundred twenty-one million, nineteen thousand, five hundred nineteen".