166161516420 has 24 divisors (see below), whose sum is σ = 465252246144. Its totient is φ = 44309737696.

The previous prime is 166161516407. The next prime is 166161516421. The reversal of 166161516420 is 24615161661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (166161516421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1384679244 + ... + 1384679363.

It is an arithmetic number, because the mean of its divisors is an integer number (19385510256).

Almost surely, 2^166161516420 is an apocalyptic number.

166161516420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166161516420 is an abundant number, since it is smaller than the sum of its proper divisors (299090729724).

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

166161516420 is a wasteful number, since it uses less digits than its factorization.

166161516420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2769358619 (or 2769358617 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 166161516420 in words is "one hundred sixty-six billion, one hundred sixty-one million, five hundred sixteen thousand, four hundred twenty".