168355517020 has 24 divisors (see below), whose sum is σ = 355104069264. Its totient is φ = 67045543296.

The previous prime is 168355516993. The next prime is 168355517021. The reversal of 168355517020 is 20715553861.

It is a happy number.

It is a super-2 number, since 2×168355517020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168355517021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18536817 + ... + 18545896.

It is an arithmetic number, because the mean of its divisors is an integer number (14796002886).

Almost surely, 2^168355517020 is an apocalyptic number.

168355517020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168355517020 is an abundant number, since it is smaller than the sum of its proper divisors (186748552244).

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

168355517020 is a wasteful number, since it uses less digits than its factorization.

168355517020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37082949 (or 37082947 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 168355517020 in words is "one hundred sixty-eight billion, three hundred fifty-five million, five hundred seventeen thousand, twenty".