11778450669 has 12 divisors (see below), whose sum is σ = 17014492092. Its totient is φ = 7851758400.

The previous prime is 11778450643. The next prime is 11778450689. The reversal of 11778450669 is 96605487711.

11778450669 is a `hidden beast` number, since 1 + 1 + 7 + 78 + 4 + 506 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3290513769 + 8487936900 = 57363^2 + 92130^2 .

It is not a de Polignac number, because 11778450669 - 2⁸ = 11778450413 is a prime.

It is a super-2 number, since 2×11778450669² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11778450689) 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 in 11 ways as a sum of consecutive naturals, for example, 126979 + ... + 199199.

It is an arithmetic number, because the mean of its divisors is an integer number (1417874341).

Almost surely, 2^11778450669 is an apocalyptic number.

It is an amenable number.

11778450669 is a deficient number, since it is larger than the sum of its proper divisors (5236041423).

11778450669 is a wasteful number, since it uses less digits than its factorization.

11778450669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90348 (or 90345 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 11778450669 in words is "eleven billion, seven hundred seventy-eight million, four hundred fifty thousand, six hundred sixty-nine".