11066261557 has 4 divisors (see below), whose sum is σ = 11917512460. Its totient is φ = 10215010656.

The previous prime is 11066261543. The next prime is 11066261573. The reversal of 11066261557 is 75516266011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75516266011 = 31 ⋅2436008581.

It can be written as a sum of positive squares in 2 ways, for example, as 2596004401 + 8470257156 = 50951^2 + 92034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11066261557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11066261357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425625432 + ... + 425625457.

It is an arithmetic number, because the mean of its divisors is an integer number (2979378115).

Almost surely, 2^11066261557 is an apocalyptic number.

It is an amenable number.

11066261557 is a deficient number, since it is larger than the sum of its proper divisors (851250903).

11066261557 is an equidigital number, since it uses as much as digits as its factorization.

11066261557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851250902.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 11066261557 in words is "eleven billion, sixty-six million, two hundred sixty-one thousand, five hundred fifty-seven".