20170368666 has 96 divisors (see below), whose sum is σ = 52170543360. Its totient is φ = 5510115072.

The previous prime is 20170368649. The next prime is 20170368667. The reversal of 20170368666 is 66686307102.

It is not an unprimeable number, because it can be changed into a prime (20170368667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 349566 + ... + 403158.

It is an arithmetic number, because the mean of its divisors is an integer number (543443160).

Almost surely, 2^20170368666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20170368666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26085271680).

20170368666 is an abundant number, since it is smaller than the sum of its proper divisors (32000174694).

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

20170368666 is a wasteful number, since it uses less digits than its factorization.

20170368666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53740 (or 53737 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 20170368666 in words is "twenty billion, one hundred seventy million, three hundred sixty-eight thousand, six hundred sixty-six".