40320323261 has 2 divisors, whose sum is σ = 40320323262. Its totient is φ = 40320323260.

The previous prime is 40320323227. The next prime is 40320323269. The reversal of 40320323261 is 16232302304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39957611236 + 362712025 = 199894^2 + 19045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40320323261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40320323261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40320323269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20160161630 + 20160161631.

It is an arithmetic number, because the mean of its divisors is an integer number (20160161631).

Almost surely, 2^40320323261 is an apocalyptic number.

It is an amenable number.

40320323261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40320323261 is an equidigital number, since it uses as much as digits as its factorization.

40320323261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 40320323261 its reverse (16232302304), we get a palindrome (56552625565).

The spelling of 40320323261 in words is "forty billion, three hundred twenty million, three hundred twenty-three thousand, two hundred sixty-one".