188620301081 has 2 divisors, whose sum is σ = 188620301082. Its totient is φ = 188620301080.

The previous prime is 188620301011. The next prime is 188620301083. The reversal of 188620301081 is 180103026881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131635449856 + 56984851225 = 362816^2 + 238715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188620301081 is a prime.

It is a super-3 number, since 3×188620301081³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 188620301083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188620301083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94310150540 + 94310150541.

It is an arithmetic number, because the mean of its divisors is an integer number (94310150541).

Almost surely, 2^188620301081 is an apocalyptic number.

It is an amenable number.

188620301081 is a deficient number, since it is larger than the sum of its proper divisors (1).

188620301081 is an equidigital number, since it uses as much as digits as its factorization.

188620301081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 38.

The spelling of 188620301081 in words is "one hundred eighty-eight billion, six hundred twenty million, three hundred one thousand, eighty-one".