11666711647 has 8 divisors (see below), whose sum is σ = 12368546432. Its totient is φ = 10985220000.

The previous prime is 11666711599. The next prime is 11666711689. The reversal of 11666711647 is 74611766611.

It is a happy number.

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 11666711647 - 2¹⁵ = 11666678879 is a prime.

It is a super-2 number, since 2×11666711647² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11666711597 and 11666711606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666711447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5084604 + ... + 5086897.

It is an arithmetic number, because the mean of its divisors is an integer number (1546068304).

Almost surely, 2^11666711647 is an apocalyptic number.

11666711647 is a deficient number, since it is larger than the sum of its proper divisors (701834785).

11666711647 is a wasteful number, since it uses less digits than its factorization.

11666711647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10171569.

The product of its digits is 254016, while the sum is 46.

The spelling of 11666711647 in words is "eleven billion, six hundred sixty-six million, seven hundred eleven thousand, six hundred forty-seven".