168117722640 has 1120 divisors, whose sum is σ = 701010537216. Its totient is φ = 36682813440.

The previous prime is 168117722639. The next prime is 168117722671. The reversal of 168117722640 is 46227711861.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 1070813442 + ... + 1070813598.

Almost surely, 2^168117722640 is an apocalyptic number.

168117722640 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 168117722640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350505268608).

168117722640 is an abundant number, since it is smaller than the sum of its proper divisors (532892814576).

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

168117722640 is a wasteful number, since it uses less digits than its factorization.

168117722640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 168117722640 in words is "one hundred sixty-eight billion, one hundred seventeen million, seven hundred twenty-two thousand, six hundred forty".