666116611 has 4 divisors (see below), whose sum is σ = 701175400. Its totient is φ = 631057824.

The previous prime is 666116603. The next prime is 666116629. The reversal of 666116611 is 116611666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116611666 = 2 ⋅58305833.

It is a cyclic number.

It is not a de Polignac number, because 666116611 - 2³ = 666116603 is a prime.

It is a super-2 number, since 2×666116611² = 887422678900250642, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (666116641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17529366 + ... + 17529403.

It is an arithmetic number, because the mean of its divisors is an integer number (175293850).

Almost surely, 2^666116611 is an apocalyptic number.

666116611 is a deficient number, since it is larger than the sum of its proper divisors (35058789).

666116611 is a wasteful number, since it uses less digits than its factorization.

666116611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35058788.

The product of its digits is 7776, while the sum is 34.

The square root of 666116611 is about 25809.2349944744. The cubic root of 666116611 is about 873.3401396856.

The spelling of 666116611 in words is "six hundred sixty-six million, one hundred sixteen thousand, six hundred eleven".