18406621103923 has 8 divisors (see below), whose sum is σ = 19822548355568. Its totient is φ = 16990698612384.

The previous prime is 18406621103903. The next prime is 18406621103947. The reversal of 18406621103923 is 32930112660481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18406621103923 - 2⁹ = 18406621103411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18406621103903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14660236 + ... + 15866182.

It is an arithmetic number, because the mean of its divisors is an integer number (2477818544446).

Almost surely, 2^{18406621103923} is an apocalyptic number.

18406621103923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18406621103923 is a deficient number, since it is larger than the sum of its proper divisors (1415927251645).

18406621103923 is a wasteful number, since it uses less digits than its factorization.

18406621103923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380053.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 18406621103923 in words is "eighteen trillion, four hundred six billion, six hundred twenty-one million, one hundred three thousand, nine hundred twenty-three".