188815220385 has 16 divisors (see below), whose sum is σ = 329568384960. Its totient is φ = 91546773440.

The previous prime is 188815220317. The next prime is 188815220387. The reversal of 188815220385 is 583022518881.

It is not a de Polignac number, because 188815220385 - 2³⁵ = 154455482017 is a prime.

It is a super-2 number, since 2×188815220385² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (188815220387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 572167170 + ... + 572167499.

It is an arithmetic number, because the mean of its divisors is an integer number (20598024060).

Almost surely, 2^188815220385 is an apocalyptic number.

188815220385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

188815220385 is a deficient number, since it is larger than the sum of its proper divisors (140753164575).

188815220385 is a wasteful number, since it uses less digits than its factorization.

188815220385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144334688.

The product of its (nonzero) digits is 1228800, while the sum is 51.

The spelling of 188815220385 in words is "one hundred eighty-eight billion, eight hundred fifteen million, two hundred twenty thousand, three hundred eighty-five".