11766221257 has 8 divisors (see below), whose sum is σ = 14154852800. Its totient is φ = 9554525424.

The previous prime is 11766221231. The next prime is 11766221263. The reversal of 11766221257 is 75212266711.

11766221257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11766221257 - 2²³ = 11757832649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11766221267) 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 7 ways as a sum of consecutive naturals, for example, 44233782 + ... + 44234047.

It is an arithmetic number, because the mean of its divisors is an integer number (1769356600).

Almost surely, 2^11766221257 is an apocalyptic number.

It is an amenable number.

11766221257 is a deficient number, since it is larger than the sum of its proper divisors (2388631543).

11766221257 is an equidigital number, since it uses as much as digits as its factorization.

11766221257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88467855.

The product of its digits is 70560, while the sum is 40.

Adding to 11766221257 its reverse (75212266711), we get a palindrome (86978487968).

The spelling of 11766221257 in words is "eleven billion, seven hundred sixty-six million, two hundred twenty-one thousand, two hundred fifty-seven".