166597523712 has 720 divisors, whose sum is σ = 552677135472. Its totient is φ = 49686773760.

The previous prime is 166597523711. The next prime is 166597523753. The reversal of 166597523712 is 217325795661.

It is a happy number.

166597523712 is a `hidden beast` number, since 1 + 6 + 6 + 597 + 5 + 2 + 37 + 12 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 56522209536 + 110075314176 = 237744^2 + 331776^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (166597523711) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 691275912 + ... + 691276152.

Almost surely, 2^166597523712 is an apocalyptic number.

166597523712 is a gapful number since it is divisible by the number (12) 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 166597523712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276338567736).

166597523712 is an abundant number, since it is smaller than the sum of its proper divisors (386079611760).

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

166597523712 is a wasteful number, since it uses less digits than its factorization.

166597523712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 353 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The spelling of 166597523712 in words is "one hundred sixty-six billion, five hundred ninety-seven million, five hundred twenty-three thousand, seven hundred twelve".