11646921785 has 8 divisors (see below), whose sum is σ = 14048723400. Its totient is φ = 9269259264.

The previous prime is 11646921763. The next prime is 11646921787. The reversal of 11646921785 is 58712964611.

It can be written as a sum of positive squares in 4 ways, for example, as 1857006649 + 9789915136 = 43093^2 + 98944^2 .

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 11646921785 - 2²⁰ = 11645873209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11646921787) 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 7 ways as a sum of consecutive naturals, for example, 6033710 + ... + 6035639.

It is an arithmetic number, because the mean of its divisors is an integer number (1756090425).

Almost surely, 2^11646921785 is an apocalyptic number.

It is an amenable number.

11646921785 is a deficient number, since it is larger than the sum of its proper divisors (2401801615).

11646921785 is a wasteful number, since it uses less digits than its factorization.

11646921785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12069547.

The product of its digits is 725760, while the sum is 50.

The spelling of 11646921785 in words is "eleven billion, six hundred forty-six million, nine hundred twenty-one thousand, seven hundred eighty-five".