18220402489 has 16 divisors (see below), whose sum is σ = 19500480000. Its totient is φ = 16986332160.

The previous prime is 18220402481. The next prime is 18220402531. The reversal of 18220402489 is 98420402281.

It is a cyclic number.

It is not a de Polignac number, because 18220402489 - 2³ = 18220402481 is a prime.

It is a super-2 number, since 2×18220402489² (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 (18220402481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381082 + ... + 426220.

It is an arithmetic number, because the mean of its divisors is an integer number (1218780000).

Almost surely, 2^18220402489 is an apocalyptic number.

It is an amenable number.

18220402489 is a deficient number, since it is larger than the sum of its proper divisors (1280077511).

18220402489 is a wasteful number, since it uses less digits than its factorization.

18220402489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45648.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 18220402489 in words is "eighteen billion, two hundred twenty million, four hundred two thousand, four hundred eighty-nine".