188354821801 has 2 divisors, whose sum is σ = 188354821802. Its totient is φ = 188354821800.

The previous prime is 188354821717. The next prime is 188354821819. The reversal of 188354821801 is 108128453881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173189145600 + 15165676201 = 416160^2 + 123149^2 .

It is a cyclic number.

It is not a de Polignac number, because 188354821801 - 2⁹ = 188354821289 is a prime.

It is not a weakly prime, because it can be changed into another prime (188354821841) 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 as a sum of consecutive naturals, namely, 94177410900 + 94177410901.

It is an arithmetic number, because the mean of its divisors is an integer number (94177410901).

Almost surely, 2^188354821801 is an apocalyptic number.

It is an amenable number.

188354821801 is a deficient number, since it is larger than the sum of its proper divisors (1).

188354821801 is an equidigital number, since it uses as much as digits as its factorization.

188354821801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 491520, while the sum is 49.

The spelling of 188354821801 in words is "one hundred eighty-eight billion, three hundred fifty-four million, eight hundred twenty-one thousand, eight hundred one".