11887156717 has 2 divisors, whose sum is σ = 11887156718. Its totient is φ = 11887156716.

The previous prime is 11887156667. The next prime is 11887156727. The reversal of 11887156717 is 71765178811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10125591876 + 1761564841 = 100626^2 + 41971^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11887156717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11887156727) 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, 5943578358 + 5943578359.

It is an arithmetic number, because the mean of its divisors is an integer number (5943578359).

Almost surely, 2^11887156717 is an apocalyptic number.

It is an amenable number.

11887156717 is a deficient number, since it is larger than the sum of its proper divisors (1).

11887156717 is an equidigital number, since it uses as much as digits as its factorization.

11887156717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658560, while the sum is 52.

The spelling of 11887156717 in words is "eleven billion, eight hundred eighty-seven million, one hundred fifty-six thousand, seven hundred seventeen".