181207901898 has 64 divisors (see below), whose sum is σ = 409253270400. Its totient is φ = 59421548160.

The previous prime is 181207901893. The next prime is 181207901909. The reversal of 181207901898 is 898109702181.

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 (181207901891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1474353 + ... + 1592523.

It is an arithmetic number, because the mean of its divisors is an integer number (6394582350).

Almost surely, 2^181207901898 is an apocalyptic number.

181207901898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 181207901898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204626635200).

181207901898 is an abundant number, since it is smaller than the sum of its proper divisors (228045368502).

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

181207901898 is a wasteful number, since it uses less digits than its factorization.

181207901898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118644 (or 118638 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 54.

The spelling of 181207901898 in words is "one hundred eighty-one billion, two hundred seven million, nine hundred one thousand, eight hundred ninety-eight".