18106823640 has 64 divisors (see below), whose sum is σ = 55064613600. Its totient is φ = 4762340352.

The previous prime is 18106823611. The next prime is 18106823653. The reversal of 18106823640 is 4632860181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1024735 + ... + 1042254.

Almost surely, 2^18106823640 is an apocalyptic number.

18106823640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18106823640 is an abundant number, since it is smaller than the sum of its proper divisors (36957789960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18106823640 is a wasteful number, since it uses less digits than its factorization.

18106823640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067076 (or 2067072 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 18106823640 in words is "eighteen billion, one hundred six million, eight hundred twenty-three thousand, six hundred forty".