188475217649 has 2 divisors, whose sum is σ = 188475217650. Its totient is φ = 188475217648.

The previous prime is 188475217631. The next prime is 188475217669. The reversal of 188475217649 is 946712574881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188008960000 + 466257649 = 433600^2 + 21593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188475217649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188475217591 and 188475217600.

It is not a weakly prime, because it can be changed into another prime (188475217669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94237608824 + 94237608825.

It is an arithmetic number, because the mean of its divisors is an integer number (94237608825).

Almost surely, 2^188475217649 is an apocalyptic number.

It is an amenable number.

188475217649 is a deficient number, since it is larger than the sum of its proper divisors (1).

188475217649 is an equidigital number, since it uses as much as digits as its factorization.

188475217649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27095040, while the sum is 62.

The spelling of 188475217649 in words is "one hundred eighty-eight billion, four hundred seventy-five million, two hundred seventeen thousand, six hundred forty-nine".