168722561440 has 192 divisors, whose sum is σ = 416283960960. Its totient is φ = 64544256000.

The previous prime is 168722561341. The next prime is 168722561461. The reversal of 168722561440 is 44165227861.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 322605019 + ... + 322605541.

It is an arithmetic number, because the mean of its divisors is an integer number (2168145630).

Almost surely, 2^168722561440 is an apocalyptic number.

168722561440 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 168722561440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208141980480).

168722561440 is an abundant number, since it is smaller than the sum of its proper divisors (247561399520).

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

168722561440 is a wasteful number, since it uses less digits than its factorization.

168722561440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095 (or 1087 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 168722561440 in words is "one hundred sixty-eight billion, seven hundred twenty-two million, five hundred sixty-one thousand, four hundred forty".