163697905440 has 576 divisors, whose sum is σ = 601233010560. Its totient is φ = 40477409280.

The previous prime is 163697905429. The next prime is 163697905463. The reversal of 163697905440 is 44509796361.

163697905440 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 9 + 7 + 90 + 544 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 114714007 + ... + 114715433.

It is an arithmetic number, because the mean of its divisors is an integer number (1043807310).

Almost surely, 2^163697905440 is an apocalyptic number.

163697905440 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 163697905440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300616505280).

163697905440 is an abundant number, since it is smaller than the sum of its proper divisors (437535105120).

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

163697905440 is a wasteful number, since it uses less digits than its factorization.

163697905440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585 (or 1574 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 163697905440 in words is "one hundred sixty-three billion, six hundred ninety-seven million, nine hundred five thousand, four hundred forty".