11855698019251 has 2 divisors, whose sum is σ = 11855698019252. Its totient is φ = 11855698019250.

The previous prime is 11855698019239. The next prime is 11855698019309. The reversal of 11855698019251 is 15291089655811.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11855698019251 - 2⁵ = 11855698019219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11855698019251.

It is not a weakly prime, because it can be changed into another prime (11855698019201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5927849009625 + 5927849009626.

It is an arithmetic number, because the mean of its divisors is an integer number (5927849009626).

Almost surely, 2^{11855698019251} is an apocalyptic number.

11855698019251 is a deficient number, since it is larger than the sum of its proper divisors (1).

11855698019251 is an equidigital number, since it uses as much as digits as its factorization.

11855698019251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776000, while the sum is 61.

The spelling of 11855698019251 in words is "eleven trillion, eight hundred fifty-five billion, six hundred ninety-eight million, nineteen thousand, two hundred fifty-one".