181639284590472 has 64 divisors (see below), whose sum is σ = 469793721052800. Its totient is φ = 58454022036480.

The previous prime is 181639284590471. The next prime is 181639284590513. The reversal of 181639284590472 is 274095482936181.

It is a junction number, because it is equal to n+sod(n) for n = 181639284590397 and 181639284590406.

It is not an unprimeable number, because it can be changed into a prime (181639284590471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1403868 + ... + 19111499.

It is an arithmetic number, because the mean of its divisors is an integer number (7340526891450).

It is a 2-persistent number, because it is pandigital, and so is 2⋅181639284590472 = 363278569180944, but 3⋅181639284590472 = 544917853771416 is not.

Almost surely, 2^{181639284590472} is an apocalyptic number.

181639284590472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181639284590472 is an abundant number, since it is smaller than the sum of its proper divisors (288154436462328).

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

181639284590472 is a wasteful number, since it uses less digits than its factorization.

181639284590472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20528126 (or 20528122 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 69.

The spelling of 181639284590472 in words is "one hundred eighty-one trillion, six hundred thirty-nine billion, two hundred eighty-four million, five hundred ninety thousand, four hundred seventy-two".