18400720200355 has 4 divisors (see below), whose sum is σ = 22080864240432. Its totient is φ = 14720576160280.

The previous prime is 18400720200353. The next prime is 18400720200361. The reversal of 18400720200355 is 55300202700481.

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

It is not a de Polignac number, because 18400720200355 - 2¹ = 18400720200353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18400720200353) 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, 1840072020031 + ... + 1840072020040.

It is an arithmetic number, because the mean of its divisors is an integer number (5520216060108).

Almost surely, 2^{18400720200355} is an apocalyptic number.

18400720200355 is a deficient number, since it is larger than the sum of its proper divisors (3680144040077).

18400720200355 is an equidigital number, since it uses as much as digits as its factorization.

18400720200355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680144040076.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 18400720200355 in words is "eighteen trillion, four hundred billion, seven hundred twenty million, two hundred thousand, three hundred fifty-five".