188878490649 has 12 divisors (see below), whose sum is σ = 272961129636. Its totient is φ = 125855927712.

The previous prime is 188878490621. The next prime is 188878490651. The reversal of 188878490649 is 946094878881.

It is a happy number.

188878490649 is a `hidden beast` number, since 1 + 8 + 8 + 8 + 78 + 490 + 64 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 58802855049 + 130075635600 = 242493^2 + 360660^2 .

It is not a de Polignac number, because 188878490649 - 2⁵ = 188878490617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (188878480649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5236534 + ... + 5272479.

It is an arithmetic number, because the mean of its divisors is an integer number (22746760803).

Almost surely, 2^188878490649 is an apocalyptic number.

It is an amenable number.

188878490649 is a deficient number, since it is larger than the sum of its proper divisors (84082638987).

188878490649 is a wasteful number, since it uses less digits than its factorization.

188878490649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10511016 (or 10511013 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 72.

The spelling of 188878490649 in words is "one hundred eighty-eight billion, eight hundred seventy-eight million, four hundred ninety thousand, six hundred forty-nine".