11111101009978 has 8 divisors (see below), whose sum is σ = 17073155210580. Its totient is φ = 5420049273120.

The previous prime is 11111101009927. The next prime is 11111101009979. The reversal of 11111101009978 is 87990010111111.

It can be written as a sum of positive squares in 2 ways, for example, as 8944543692049 + 2166557317929 = 2990743^2 + 1471923^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 11111101009978.

It is not an unprimeable number, because it can be changed into a prime (11111101009979) 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 3 ways as a sum of consecutive naturals, for example, 67750615833 + ... + 67750615996.

Almost surely, 2^{11111101009978} is an apocalyptic number.

11111101009978 is a deficient number, since it is larger than the sum of its proper divisors (5962054200602).

11111101009978 is a wasteful number, since it uses less digits than its factorization.

11111101009978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135501231872.

The product of its (nonzero) digits is 4536, while the sum is 40.

The spelling of 11111101009978 in words is "eleven trillion, one hundred eleven billion, one hundred one million, nine thousand, nine hundred seventy-eight".