20440523161 has 2 divisors, whose sum is σ = 20440523162. Its totient is φ = 20440523160.

The previous prime is 20440523137. The next prime is 20440523179. The reversal of 20440523161 is 16132504402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20186726400 + 253796761 = 142080^2 + 15931^2 .

It is a cyclic number.

It is not a de Polignac number, because 20440523161 - 2¹¹ = 20440521113 is a prime.

It is not a weakly prime, because it can be changed into another prime (20440520161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220261580 + 10220261581.

It is an arithmetic number, because the mean of its divisors is an integer number (10220261581).

Almost surely, 2^20440523161 is an apocalyptic number.

It is an amenable number.

20440523161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440523161 is an equidigital number, since it uses as much as digits as its factorization.

20440523161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 20440523161 in words is "twenty billion, four hundred forty million, five hundred twenty-three thousand, one hundred sixty-one".