666169613800 has 96 divisors (see below), whose sum is σ = 1586806562880. Its totient is φ = 259951910400.

The previous prime is 666169613783. The next prime is 666169613827. The reversal of 666169613800 is 8316961666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7030740 + ... + 7124860.

It is an arithmetic number, because the mean of its divisors is an integer number (16529235030).

Almost surely, 2^666169613800 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666169613800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793403281440).

666169613800 is an abundant number, since it is smaller than the sum of its proper divisors (920636949080).

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

666169613800 is a wasteful number, since it uses less digits than its factorization.

666169613800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95003 (or 94994 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 666169613800 in words is "six hundred sixty-six billion, one hundred sixty-nine million, six hundred thirteen thousand, eight hundred".