166530663640 has 64 divisors (see below), whose sum is σ = 411877509120. Its totient is φ = 60094320000.

The previous prime is 166530663617. The next prime is 166530663641. The reversal of 166530663640 is 46366035661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166530663641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386936 + ... + 1502215.

It is an arithmetic number, because the mean of its divisors is an integer number (6435586080).

Almost surely, 2^166530663640 is an apocalyptic number.

166530663640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166530663640 is an abundant number, since it is smaller than the sum of its proper divisors (245346845480).

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

166530663640 is a wasteful number, since it uses less digits than its factorization.

166530663640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889304 (or 2889300 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 166530663640 in words is "one hundred sixty-six billion, five hundred thirty million, six hundred sixty-three thousand, six hundred forty".