11157317550661 has 2 divisors, whose sum is σ = 11157317550662. Its totient is φ = 11157317550660.

The previous prime is 11157317550571. The next prime is 11157317550713. The reversal of 11157317550661 is 16605571375111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6388225920036 + 4769091630625 = 2527494^2 + 2183825^2 .

It is a cyclic number.

It is not a de Polignac number, because 11157317550661 - 2¹⁵ = 11157317517893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11157317550061) 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, 5578658775330 + 5578658775331.

It is an arithmetic number, because the mean of its divisors is an integer number (5578658775331).

Almost surely, 2^{11157317550661} is an apocalyptic number.

It is an amenable number.

11157317550661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11157317550661 is an equidigital number, since it uses as much as digits as its factorization.

11157317550661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 661500, while the sum is 49.

The spelling of 11157317550661 in words is "eleven trillion, one hundred fifty-seven billion, three hundred seventeen million, five hundred fifty thousand, six hundred sixty-one".