18201091100201 has 4 divisors (see below), whose sum is σ = 18213314802900. Its totient is φ = 18188867397504.

The previous prime is 18201091100147. The next prime is 18201091100221. The reversal of 18201091100201 is 10200119010281.

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 12995159814400 + 5205931285801 = 3604880^2 + 2281651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18201091100201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18201091100221) 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, 6111849116 + ... + 6111852093.

It is an arithmetic number, because the mean of its divisors is an integer number (4553328700725).

Almost surely, 2^{18201091100201} is an apocalyptic number.

It is an amenable number.

18201091100201 is a deficient number, since it is larger than the sum of its proper divisors (12223702699).

18201091100201 is a wasteful number, since it uses less digits than its factorization.

18201091100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12223702698.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 18201091100201 in words is "eighteen trillion, two hundred one billion, ninety-one million, one hundred thousand, two hundred one".