18603630621 has 12 divisors (see below), whose sum is σ = 28452611772. Its totient is φ = 11672866176.

The previous prime is 18603630593. The next prime is 18603630623. The reversal of 18603630621 is 12603630681.

18603630621 is a `hidden beast` number, since 18 + 6 + 0 + 3 + 630 + 6 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14462708121 + 4140922500 = 120261^2 + 64350^2 .

It is not a de Polignac number, because 18603630621 - 2¹¹ = 18603628573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18603630623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60796026 + ... + 60796331.

It is an arithmetic number, because the mean of its divisors is an integer number (2371050981).

Almost surely, 2^18603630621 is an apocalyptic number.

It is an amenable number.

18603630621 is a deficient number, since it is larger than the sum of its proper divisors (9848981151).

18603630621 is a wasteful number, since it uses less digits than its factorization.

18603630621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121592380 (or 121592377 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 18603630621 in words is "eighteen billion, six hundred three million, six hundred thirty thousand, six hundred twenty-one".