18019654821 has 64 divisors (see below), whose sum is σ = 30796595200. Its totient is φ = 10200541248.

The previous prime is 18019654787. The next prime is 18019654831. The reversal of 18019654821 is 12845691081.

It is a happy number.

18019654821 is a `hidden beast` number, since 1 + 80 + 1 + 9 + 6 + 548 + 21 = 666.

It is not a de Polignac number, because 18019654821 - 2¹⁰ = 18019653797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019654831) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9650730 + ... + 9652596.

It is an arithmetic number, because the mean of its divisors is an integer number (481196800).

Almost surely, 2^18019654821 is an apocalyptic number.

It is an amenable number.

18019654821 is a deficient number, since it is larger than the sum of its proper divisors (12776940379).

18019654821 is a wasteful number, since it uses less digits than its factorization.

18019654821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 18019654821 in words is "eighteen billion, nineteen million, six hundred fifty-four thousand, eight hundred twenty-one".