188940527081 has 4 divisors (see below), whose sum is σ = 195455717700. Its totient is φ = 182425336464.

The previous prime is 188940527077. The next prime is 188940527123. The reversal of 188940527081 is 180725049881.

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 144444843481 + 44495683600 = 380059^2 + 210940^2 .

It is a cyclic number.

It is not a de Polignac number, because 188940527081 - 2² = 188940527077 is a prime.

It is a super-2 number, since 2×188940527081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188940527051) 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, 3257595266 + ... + 3257595323.

It is an arithmetic number, because the mean of its divisors is an integer number (48863929425).

Almost surely, 2^188940527081 is an apocalyptic number.

It is an amenable number.

188940527081 is a deficient number, since it is larger than the sum of its proper divisors (6515190619).

188940527081 is an equidigital number, since it uses as much as digits as its factorization.

188940527081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6515190618.

The product of its (nonzero) digits is 1290240, while the sum is 53.

The spelling of 188940527081 in words is "one hundred eighty-eight billion, nine hundred forty million, five hundred twenty-seven thousand, eighty-one".