163665954810 has 128 divisors (see below), whose sum is σ = 439288012800. Its totient is φ = 43360591680.

The previous prime is 163665954791. The next prime is 163665954811. The reversal of 163665954810 is 18459566361.

163665954810 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 6 + 595 + 48 + 1 + 0 = 666.

It is a super-2 number, since 2×163665954810² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (163665954811) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30132795 + ... + 30138225.

It is an arithmetic number, because the mean of its divisors is an integer number (3431937600).

Almost surely, 2^163665954810 is an apocalyptic number.

163665954810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 163665954810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219644006400).

163665954810 is an abundant number, since it is smaller than the sum of its proper divisors (275622057990).

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

163665954810 is a wasteful number, since it uses less digits than its factorization.

163665954810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6153 (or 6147 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 163665954810 in words is "one hundred sixty-three billion, six hundred sixty-five million, nine hundred fifty-four thousand, eight hundred ten".