6616011666 has 64 divisors (see below), whose sum is σ = 14664675456. Its totient is φ = 1973184000.

The previous prime is 6616011659. The next prime is 6616011667. The reversal of 6616011666 is 6661106166.

It is a happy number.

It is a super-2 number, since 2×6616011666² = 87543220729296191112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6616011667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1150350 + ... + 1156086.

It is an arithmetic number, because the mean of its divisors is an integer number (229135554).

Almost surely, 2^6616011666 is an apocalyptic number.

6616011666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6616011666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7332337728).

6616011666 is an abundant number, since it is smaller than the sum of its proper divisors (8048663790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6616011666 is a wasteful number, since it uses less digits than its factorization.

6616011666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6027.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 6616011666 is about 81338.8693430146. The cubic root of 6616011666 is about 1877.2931153130.

The spelling of 6616011666 in words is "six billion, six hundred sixteen million, eleven thousand, six hundred sixty-six".