11785521667 has 2 divisors, whose sum is σ = 11785521668. Its totient is φ = 11785521666.

The previous prime is 11785521659. The next prime is 11785521697. The reversal of 11785521667 is 76612558711.

It is a happy number.

11785521667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11785521667 - 2³ = 11785521659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11785521667.

It is not a weakly prime, because it can be changed into another prime (11785521617) 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 as a sum of consecutive naturals, namely, 5892760833 + 5892760834.

It is an arithmetic number, because the mean of its divisors is an integer number (5892760834).

Almost surely, 2^11785521667 is an apocalyptic number.

11785521667 is a deficient number, since it is larger than the sum of its proper divisors (1).

11785521667 is an equidigital number, since it uses as much as digits as its factorization.

11785521667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 49.

The spelling of 11785521667 in words is "eleven billion, seven hundred eighty-five million, five hundred twenty-one thousand, six hundred sixty-seven".