181390349904 has 40 divisors (see below), whose sum is σ = 470946494400. Its totient is φ = 60159610368.

The previous prime is 181390349867. The next prime is 181390349953. The reversal of 181390349904 is 409943093181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9485337 + ... + 9504440.

It is an arithmetic number, because the mean of its divisors is an integer number (11773662360).

Almost surely, 2^181390349904 is an apocalyptic number.

It is an amenable number.

181390349904 is an abundant number, since it is smaller than the sum of its proper divisors (289556144496).

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

181390349904 is a wasteful number, since it uses less digits than its factorization.

181390349904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18989987 (or 18989981 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 181390349904 in words is "one hundred eighty-one billion, three hundred ninety million, three hundred forty-nine thousand, nine hundred four".