166660786000 has 80 divisors (see below), whose sum is σ = 403388498448. Its totient is φ = 66597696000.

The previous prime is 166660785983. The next prime is 166660786007. The reversal of 166660786000 is 687066661.

It can be written as a sum of positive squares in 8 ways, for example, as 146738028096 + 19922757904 = 383064^2 + 141148^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166660786007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1984870 + ... + 2067130.

Almost surely, 2^166660786000 is an apocalyptic number.

166660786000 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 166660786000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201694249224).

166660786000 is an abundant number, since it is smaller than the sum of its proper divisors (236727712448).

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

166660786000 is a wasteful number, since it uses less digits than its factorization.

166660786000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83297 (or 83281 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 166660786000 in words is "one hundred sixty-six billion, six hundred sixty million, seven hundred eighty-six thousand".