18357233713621 has 32 divisors (see below), whose sum is σ = 20613533298048. Its totient is φ = 16205594845440.

The previous prime is 18357233713579. The next prime is 18357233713631. The reversal of 18357233713621 is 12631733275381.

It is not a de Polignac number, because 18357233713621 - 2¹¹ = 18357233711573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18357233713631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68047815 + ... + 68317051.

It is an arithmetic number, because the mean of its divisors is an integer number (644172915564).

Almost surely, 2^{18357233713621} is an apocalyptic number.

18357233713621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18357233713621 is a deficient number, since it is larger than the sum of its proper divisors (2256299584427).

18357233713621 is a wasteful number, since it uses less digits than its factorization.

18357233713621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270501.

The product of its digits is 3810240, while the sum is 52.

The spelling of 18357233713621 in words is "eighteen trillion, three hundred fifty-seven billion, two hundred thirty-three million, seven hundred thirteen thousand, six hundred twenty-one".