40320321161 has 2 divisors, whose sum is σ = 40320321162. Its totient is φ = 40320321160.

The previous prime is 40320321109. The next prime is 40320321257. The reversal of 40320321161 is 16112302304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25814527561 + 14505793600 = 160669^2 + 120440^2 .

It is a cyclic number.

It is not a de Polignac number, because 40320321161 - 2¹⁰ = 40320320137 is a prime.

It is not a weakly prime, because it can be changed into another prime (40320321101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20160160580 + 20160160581.

It is an arithmetic number, because the mean of its divisors is an integer number (20160160581).

Almost surely, 2^40320321161 is an apocalyptic number.

It is an amenable number.

40320321161 is a deficient number, since it is larger than the sum of its proper divisors (1).

40320321161 is an equidigital number, since it uses as much as digits as its factorization.

40320321161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 40320321161 its reverse (16112302304), we get a palindrome (56432623465).

The spelling of 40320321161 in words is "forty billion, three hundred twenty million, three hundred twenty-one thousand, one hundred sixty-one".