163660423320 has 128 divisors (see below), whose sum is σ = 554781312000. Its totient is φ = 42903054720.

The previous prime is 163660423249. The next prime is 163660423321. The reversal of 163660423320 is 23324066361.

163660423320 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 604 + 23 + 3 + 20 = 666.

It is a super-2 number, since 2×163660423320² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163660423321) 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, 1220496 + ... + 1347935.

It is an arithmetic number, because the mean of its divisors is an integer number (4334229000).

Almost surely, 2^163660423320 is an apocalyptic number.

163660423320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163660423320 is an abundant number, since it is smaller than the sum of its proper divisors (391120888680).

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

163660423320 is a wasteful number, since it uses less digits than its factorization.

163660423320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568510 (or 2568500 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

Adding to 163660423320 its reverse (23324066361), we get a palindrome (186984489681).

The spelling of 163660423320 in words is "one hundred sixty-three billion, six hundred sixty million, four hundred twenty-three thousand, three hundred twenty".