229181666520 has 32 divisors (see below), whose sum is σ = 687544999920. Its totient is φ = 61115111040.

The previous prime is 229181666489. The next prime is 229181666543. The reversal of 229181666520 is 25666181922.

229181666520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 229181666520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954923491 + ... + 954923730.

Almost surely, 2^229181666520 is an apocalyptic number.

229181666520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

229181666520 is an abundant number, since it is smaller than the sum of its proper divisors (458363333400).

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

229181666520 is a wasteful number, since it uses less digits than its factorization.

229181666520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909847235 (or 1909847231 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 229181666520 in words is "two hundred twenty-nine billion, one hundred eighty-one million, six hundred sixty-six thousand, five hundred twenty".