1666642610610 has 192 divisors, whose sum is σ = 4445663923584. Its totient is φ = 433060992000.

The previous prime is 1666642610561. The next prime is 1666642610617. The reversal of 1666642610610 is 160162466661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666642610617) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 411413085 + ... + 411417135.

It is an arithmetic number, because the mean of its divisors is an integer number (23154499602).

Almost surely, 2^{1666642610610} is an apocalyptic number.

1666642610610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666642610610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222831961792).

1666642610610 is an abundant number, since it is smaller than the sum of its proper divisors (2779021312974).

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

1666642610610 is a wasteful number, since it uses less digits than its factorization.

1666642610610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4809 (or 4806 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 1666642610610 in words is "one trillion, six hundred sixty-six billion, six hundred forty-two million, six hundred ten thousand, six hundred ten".