181097938945 has 48 divisors (see below), whose sum is σ = 276076506816. Its totient is φ = 112770672000.

The previous prime is 181097938943. The next prime is 181097938961. The reversal of 181097938945 is 549839790181.

It is not a de Polignac number, because 181097938945 - 2¹ = 181097938943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181097938943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2500290 + ... + 2571700.

It is an arithmetic number, because the mean of its divisors is an integer number (5751593892).

Almost surely, 2^181097938945 is an apocalyptic number.

It is an amenable number.

181097938945 is a deficient number, since it is larger than the sum of its proper divisors (94978567871).

181097938945 is a wasteful number, since it uses less digits than its factorization.

181097938945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72382 (or 72375 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 181097938945 in words is "one hundred eighty-one billion, ninety-seven million, nine hundred thirty-eight thousand, nine hundred forty-five".