166440029820 has 144 divisors (see below), whose sum is σ = 484807226400. Its totient is φ = 42661793280.

The previous prime is 166440029797. The next prime is 166440029831. The reversal of 166440029820 is 28920044661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8581654 + ... + 8601026.

It is an arithmetic number, because the mean of its divisors is an integer number (3366716850).

Almost surely, 2^166440029820 is an apocalyptic number.

166440029820 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 166440029820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242403613200).

166440029820 is an abundant number, since it is smaller than the sum of its proper divisors (318367196580).

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

166440029820 is a wasteful number, since it uses less digits than its factorization.

166440029820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19596 (or 19563 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 166440029820 in words is "one hundred sixty-six billion, four hundred forty million, twenty-nine thousand, eight hundred twenty".