18393019998937 has 4 divisors (see below), whose sum is σ = 18393044470756. Its totient is φ = 18392995527120.

The previous prime is 18393019998923. The next prime is 18393019999099. The reversal of 18393019998937 is 73989991039381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16132240118016 + 2260779880921 = 4016496^2 + 1503589^2 .

It is a cyclic number.

It is not a de Polignac number, because 18393019998937 - 2⁷ = 18393019998809 is a prime.

It is a super-2 number, since 2×18393019998937² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18393019998037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11071578 + ... + 12624019.

It is an arithmetic number, because the mean of its divisors is an integer number (4598261117689).

Almost surely, 2^{18393019998937} is an apocalyptic number.

It is an amenable number.

18393019998937 is a deficient number, since it is larger than the sum of its proper divisors (24471819).

18393019998937 is an equidigital number, since it uses as much as digits as its factorization.

18393019998937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24471818.

The product of its (nonzero) digits is 714256704, while the sum is 79.

The spelling of 18393019998937 in words is "eighteen trillion, three hundred ninety-three billion, nineteen million, nine hundred ninety-eight thousand, nine hundred thirty-seven".