40240423261 has 2 divisors, whose sum is σ = 40240423262. Its totient is φ = 40240423260.

The previous prime is 40240423253. The next prime is 40240423273. The reversal of 40240423261 is 16232404204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38757403161 + 1483020100 = 196869^2 + 38510^2 .

It is a cyclic number.

It is not a de Polignac number, because 40240423261 - 2³ = 40240423253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40240423241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20120211630 + 20120211631.

It is an arithmetic number, because the mean of its divisors is an integer number (20120211631).

Almost surely, 2^40240423261 is an apocalyptic number.

It is an amenable number.

40240423261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240423261 is an equidigital number, since it uses as much as digits as its factorization.

40240423261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 40240423261 its reverse (16232404204), we get a palindrome (56472827465).

The spelling of 40240423261 in words is "forty billion, two hundred forty million, four hundred twenty-three thousand, two hundred sixty-one".