18738406744801 has 4 divisors (see below), whose sum is σ = 18948950640900. Its totient is φ = 18527862848704.

The previous prime is 18738406744787. The next prime is 18738406744807. The reversal of 18738406744801 is 10844760483781.

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 13391208360000 + 5347198384801 = 3659400^2 + 2312401^2 .

It is a cyclic number.

It is not a de Polignac number, because 18738406744801 - 2⁹ = 18738406744289 is a prime.

It is a super-2 number, since 2×18738406744801² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18738406744801.

It is not an unprimeable number, because it can be changed into a prime (18738406744807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105271947916 + ... + 105271948093.

It is an arithmetic number, because the mean of its divisors is an integer number (4737237660225).

Almost surely, 2^{18738406744801} is an apocalyptic number.

It is an amenable number.

18738406744801 is a deficient number, since it is larger than the sum of its proper divisors (210543896099).

18738406744801 is an equidigital number, since it uses as much as digits as its factorization.

18738406744801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210543896098.

The product of its (nonzero) digits is 28901376, while the sum is 61.

The spelling of 18738406744801 in words is "eighteen trillion, seven hundred thirty-eight billion, four hundred six million, seven hundred forty-four thousand, eight hundred one".