166591819788 has 48 divisors (see below), whose sum is σ = 397065037824. Its totient is φ = 54338114560.

The previous prime is 166591819763. The next prime is 166591819813. The reversal of 166591819788 is 887918195661.

It is an interprime number because it is at equal distance from previous prime (166591819763) and next prime (166591819813).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3041581 + ... + 3095867.

It is an arithmetic number, because the mean of its divisors is an integer number (8272188288).

Almost surely, 2^166591819788 is an apocalyptic number.

It is an amenable number.

166591819788 is an abundant number, since it is smaller than the sum of its proper divisors (230473218036).

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

166591819788 is a wasteful number, since it uses less digits than its factorization.

166591819788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59782 (or 59780 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 69.

The spelling of 166591819788 in words is "one hundred sixty-six billion, five hundred ninety-one million, eight hundred nineteen thousand, seven hundred eighty-eight".