180811822390805 has 8 divisors (see below), whose sum is σ = 216983812761144. Its totient is φ = 144643040651200.

The previous prime is 180811822390747. The next prime is 180811822390813. The reversal of 180811822390805 is 508093228118081.

It can be written as a sum of positive squares in 4 ways, for example, as 99189668278801 + 81622154112004 = 9959401^2 + 9034498^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 180811822390805 - 2¹² = 180811822386709 is a prime.

It is a super-2 number, since 2×180811822390805² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

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, 802033706 + ... + 802259115.

It is an arithmetic number, because the mean of its divisors is an integer number (27122976595143).

Almost surely, 2^{180811822390805} is an apocalyptic number.

It is an amenable number.

180811822390805 is a deficient number, since it is larger than the sum of its proper divisors (36171990370339).

180811822390805 is a wasteful number, since it uses less digits than its factorization.

180811822390805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604315367.

The product of its (nonzero) digits is 2211840, while the sum is 56.

The spelling of 180811822390805 in words is "one hundred eighty trillion, eight hundred eleven billion, eight hundred twenty-two million, three hundred ninety thousand, eight hundred five".