181534344449 has 16 divisors (see below), whose sum is σ = 189597542400. Its totient is φ = 173596114944.

The previous prime is 181534344443. The next prime is 181534344451. The reversal of 181534344449 is 944443435181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181534344449 is a prime.

It is a super-2 number, since 2×181534344449² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181534344397 and 181534344406.

It is not an unprimeable number, because it can be changed into a prime (181534344443) 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, 2119937 + ... + 2203905.

It is an arithmetic number, because the mean of its divisors is an integer number (11849846400).

Almost surely, 2^181534344449 is an apocalyptic number.

It is an amenable number.

181534344449 is a deficient number, since it is larger than the sum of its proper divisors (8063197951).

181534344449 is a wasteful number, since it uses less digits than its factorization.

181534344449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84712.

The product of its digits is 3317760, while the sum is 50.

The spelling of 181534344449 in words is "one hundred eighty-one billion, five hundred thirty-four million, three hundred forty-four thousand, four hundred forty-nine".