166705865040 has 640 divisors, whose sum is σ = 635566321152. Its totient is φ = 35597352960.

The previous prime is 166705864999. The next prime is 166705865113. The reversal of 166705865040 is 40568507661.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 67300282 + ... + 67302758.

Almost surely, 2^166705865040 is an apocalyptic number.

166705865040 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 166705865040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317783160576).

166705865040 is an abundant number, since it is smaller than the sum of its proper divisors (468860456112).

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

166705865040 is a wasteful number, since it uses less digits than its factorization.

166705865040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2607 (or 2601 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 166705865040 in words is "one hundred sixty-six billion, seven hundred five million, eight hundred sixty-five thousand, forty".