180820631011 has 16 divisors (see below), whose sum is σ = 188324792320. Its totient is φ = 173425328640.

The previous prime is 180820631009. The next prime is 180820631027. The reversal of 180820631011 is 110136028081.

It is not a de Polignac number, because 180820631011 - 2¹ = 180820631009 is a prime.

It is a super-2 number, since 2×180820631011² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180820631611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2449930 + ... + 2522656.

It is an arithmetic number, because the mean of its divisors is an integer number (11770299520).

Almost surely, 2^180820631011 is an apocalyptic number.

180820631011 is a deficient number, since it is larger than the sum of its proper divisors (7504161309).

180820631011 is a wasteful number, since it uses less digits than its factorization.

180820631011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73474.

The product of its (nonzero) digits is 2304, while the sum is 31.

Adding to 180820631011 its reverse (110136028081), we get a palindrome (290956659092).

The spelling of 180820631011 in words is "one hundred eighty billion, eight hundred twenty million, six hundred thirty-one thousand, eleven".