166556240340 has 192 divisors, whose sum is σ = 540996599808. Its totient is φ = 37498406400.

The previous prime is 166556240327. The next prime is 166556240381. The reversal of 166556240340 is 43042655661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 166556240292 and 166556240301.

It is a congruent number.

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, 43863322 + ... + 43867118.

It is an arithmetic number, because the mean of its divisors is an integer number (2817690624).

Almost surely, 2^166556240340 is an apocalyptic number.

166556240340 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 166556240340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270498299904).

166556240340 is an abundant number, since it is smaller than the sum of its proper divisors (374440359468).

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

166556240340 is a wasteful number, since it uses less digits than its factorization.

166556240340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358 (or 5356 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 166556240340 in words is "one hundred sixty-six billion, five hundred fifty-six million, two hundred forty thousand, three hundred forty".