11505780226 has 16 divisors (see below), whose sum is σ = 17683890840. Its totient is φ = 5611217920.

The previous prime is 11505780203. The next prime is 11505780233. The reversal of 11505780226 is 62208750511.

It is a Cunningham number, because it is equal to 107265²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 2921943025 + 8583837201 = 54055^2 + 92649^2 .

It is a super-2 number, since 2×11505780226² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380430 + ... + 409558.

Almost surely, 2^11505780226 is an apocalyptic number.

11505780226 is a deficient number, since it is larger than the sum of its proper divisors (6178110614).

11505780226 is a wasteful number, since it uses less digits than its factorization.

11505780226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33989.

The product of its (nonzero) digits is 33600, while the sum is 37.

The spelling of 11505780226 in words is "eleven billion, five hundred five million, seven hundred eighty thousand, two hundred twenty-six".