666651616111 has 12 divisors (see below), whose sum is σ = 721971251568. Its totient is φ = 615290542464.

The previous prime is 666651616049. The next prime is 666651616123. The reversal of 666651616111 is 111616156666.

It is not a de Polignac number, because 666651616111 - 2¹⁷ = 666651485039 is a prime.

It is a super-2 number, since 2×666651616111² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666651616181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1063926 + ... + 1570108.

It is an arithmetic number, because the mean of its divisors is an integer number (60164270964).

Almost surely, 2^666651616111 is an apocalyptic number.

666651616111 is a deficient number, since it is larger than the sum of its proper divisors (55319635457).

666651616111 is a wasteful number, since it uses less digits than its factorization.

666651616111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514002 (or 513989 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The spelling of 666651616111 in words is "six hundred sixty-six billion, six hundred fifty-one million, six hundred sixteen thousand, one hundred eleven".