180621022081 has 2 divisors, whose sum is σ = 180621022082. Its totient is φ = 180621022080.

The previous prime is 180621022069. The next prime is 180621022097. The reversal of 180621022081 is 180220126081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128837923600 + 51783098481 = 358940^2 + 227559^2 .

It is a cyclic number.

It is not a de Polignac number, because 180621022081 - 2¹⁵ = 180620989313 is a prime.

It is a super-2 number, since 2×180621022081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (180621022181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90310511040 + 90310511041.

It is an arithmetic number, because the mean of its divisors is an integer number (90310511041).

Almost surely, 2^180621022081 is an apocalyptic number.

It is an amenable number.

180621022081 is a deficient number, since it is larger than the sum of its proper divisors (1).

180621022081 is an equidigital number, since it uses as much as digits as its factorization.

180621022081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 31.

The spelling of 180621022081 in words is "one hundred eighty billion, six hundred twenty-one million, twenty-two thousand, eighty-one".