166366740540 has 576 divisors, whose sum is σ = 632739179520. Its totient is φ = 31781376000.

The previous prime is 166366740523. The next prime is 166366740587. The reversal of 166366740540 is 45047663661.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 166366740540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 276816240 + ... + 276816840.

It is an arithmetic number, because the mean of its divisors is an integer number (1098505520).

Almost surely, 2^166366740540 is an apocalyptic number.

166366740540 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 166366740540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316369589760).

166366740540 is an abundant number, since it is smaller than the sum of its proper divisors (466372438980).

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

166366740540 is a wasteful number, since it uses less digits than its factorization.

166366740540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074 (or 1061 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 48.

The spelling of 166366740540 in words is "one hundred sixty-six billion, three hundred sixty-six million, seven hundred forty thousand, five hundred forty".