168349736640 has 224 divisors, whose sum is σ = 542871818496. Its totient is φ = 44194877440.

The previous prime is 168349736629. The next prime is 168349736647. The reversal of 168349736640 is 46637943861.

It is not an unprimeable number, because it can be changed into a prime (168349736647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23342635 + ... + 23349845.

It is an arithmetic number, because the mean of its divisors is an integer number (2423534904).

Almost surely, 2^168349736640 is an apocalyptic number.

168349736640 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 168349736640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271435909248).

168349736640 is an abundant number, since it is smaller than the sum of its proper divisors (374522081856).

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

168349736640 is a wasteful number, since it uses less digits than its factorization.

168349736640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7607 (or 7597 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 57.

The spelling of 168349736640 in words is "one hundred sixty-eight billion, three hundred forty-nine million, seven hundred thirty-six thousand, six hundred forty".