18353442646 has 48 divisors (see below), whose sum is σ = 34966572480. Its totient is φ = 7144483920.

The previous prime is 18353442643. The next prime is 18353442697. The reversal of 18353442646 is 64624435381.

It is a super-2 number, since 2×18353442646² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18353442596 and 18353442605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18353442643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1350441 + ... + 1363963.

It is an arithmetic number, because the mean of its divisors is an integer number (728470260).

Almost surely, 2^18353442646 is an apocalyptic number.

18353442646 is a deficient number, since it is larger than the sum of its proper divisors (16613129834).

18353442646 is a wasteful number, since it uses less digits than its factorization.

18353442646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14809 (or 14802 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 46.

The spelling of 18353442646 in words is "eighteen billion, three hundred fifty-three million, four hundred forty-two thousand, six hundred forty-six".