181198080981 has 24 divisors (see below), whose sum is σ = 270826508160. Its totient is φ = 116602768800.

The previous prime is 181198080979. The next prime is 181198081061. The reversal of 181198080981 is 189080891181.

It is not a de Polignac number, because 181198080981 - 2¹ = 181198080979 is a prime.

It is a super-2 number, since 2×181198080981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181198084981) 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, 932016 + ... + 1109526.

It is an arithmetic number, because the mean of its divisors is an integer number (11284437840).

Almost surely, 2^181198080981 is an apocalyptic number.

It is an amenable number.

181198080981 is a deficient number, since it is larger than the sum of its proper divisors (89628427179).

181198080981 is a wasteful number, since it uses less digits than its factorization.

181198080981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181457 (or 181454 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 54.

The spelling of 181198080981 in words is "one hundred eighty-one billion, one hundred ninety-eight million, eighty thousand, nine hundred eighty-one".