166994499660 has 192 divisors, whose sum is σ = 495500544000. Its totient is φ = 41938034688.

The previous prime is 166994499653. The next prime is 166994499799. The reversal of 166994499660 is 66994499661.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26635006 + ... + 26641274.

It is an arithmetic number, because the mean of its divisors is an integer number (2580732000).

Almost surely, 2^166994499660 is an apocalyptic number.

166994499660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166994499660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247750272000).

166994499660 is an abundant number, since it is smaller than the sum of its proper divisors (328506044340).

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

166994499660 is a wasteful number, since it uses less digits than its factorization.

166994499660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6600 (or 6598 counting only the distinct ones).

The product of its (nonzero) digits is 136048896, while the sum is 69.

Subtracting from 166994499660 its reverse (66994499661), we obtain a palindrome (99999999999).

The spelling of 166994499660 in words is "one hundred sixty-six billion, nine hundred ninety-four million, four hundred ninety-nine thousand, six hundred sixty".