180404917081 has 27 divisors (see below), whose sum is σ = 192455116959. Its totient is φ = 169094488992.

The previous prime is 180404917057. The next prime is 180404917087. The reversal of 180404917081 is 180719404081.

It is a happy number.

The square root of 180404917081 is 424741.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1150905625 + 179254011456 = 33925^2 + 423384^2 .

It is not a de Polignac number, because 180404917081 - 2⁷ = 180404916953 is a prime.

It is a super-2 number, since 2×180404917081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180404917087) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 576373381 + ... + 576373693.

Almost surely, 2^180404917081 is an apocalyptic number.

180404917081 is the 424741-st square number.

180404917081 is the 212371-st centered octagonal number.

It is an amenable number.

180404917081 is a deficient number, since it is larger than the sum of its proper divisors (12050199878).

180404917081 is an frugal number, since it uses more digits than its factorization.

180404917081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The spelling of 180404917081 in words is "one hundred eighty billion, four hundred four million, nine hundred seventeen thousand, eighty-one".