188748146581 has 2 divisors, whose sum is σ = 188748146582. Its totient is φ = 188748146580.

The previous prime is 188748146537. The next prime is 188748146597. The reversal of 188748146581 is 185641847881.

188748146581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186767451556 + 1980695025 = 432166^2 + 44505^2 .

It is a cyclic number.

It is not a de Polignac number, because 188748146581 - 2⁷ = 188748146453 is a prime.

It is a super-2 number, since 2×188748146581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188748146281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94374073290 + 94374073291.

It is an arithmetic number, because the mean of its divisors is an integer number (94374073291).

Almost surely, 2^188748146581 is an apocalyptic number.

It is an amenable number.

188748146581 is a deficient number, since it is larger than the sum of its proper divisors (1).

188748146581 is an equidigital number, since it uses as much as digits as its factorization.

188748146581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13762560, while the sum is 61.

The spelling of 188748146581 in words is "one hundred eighty-eight billion, seven hundred forty-eight million, one hundred forty-six thousand, five hundred eighty-one".