181989071352 has 96 divisors (see below), whose sum is σ = 555660008400. Its totient is φ = 55148195520.

The previous prime is 181989071309. The next prime is 181989071353. The reversal of 181989071352 is 253170989181.

181989071352 is a `hidden beast` number, since 18 + 198 + 90 + 7 + 1 + 352 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181989071353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3455443 + ... + 3507714.

Almost surely, 2^181989071352 is an apocalyptic number.

181989071352 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181989071352 is an abundant number, since it is smaller than the sum of its proper divisors (373670937048).

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

181989071352 is a wasteful number, since it uses less digits than its factorization.

181989071352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6963194 (or 6963173 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The spelling of 181989071352 in words is "one hundred eighty-one billion, nine hundred eighty-nine million, seventy-one thousand, three hundred fifty-two".