6665242425666 has 80 divisors (see below), whose sum is σ = 15300987894720. Its totient is φ = 1931953740640.

The previous prime is 6665242425659. The next prime is 6665242425719.

It is a happy number.

6665242425666 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 371020 + ... + 3669896.

It is an arithmetic number, because the mean of its divisors is an integer number (191262348684).

Almost surely, 2^{6665242425666} is an apocalyptic number.

6665242425666 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 6665242425666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7650493947360).

6665242425666 is an abundant number, since it is smaller than the sum of its proper divisors (8635745469054).

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

6665242425666 is a wasteful number, since it uses less digits than its factorization.

6665242425666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298949 (or 3298916 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 60.

The spelling of 6665242425666 in words is "six trillion, six hundred sixty-five billion, two hundred forty-two million, four hundred twenty-five thousand, six hundred sixty-six".