40642433761 has 2 divisors, whose sum is σ = 40642433762. Its totient is φ = 40642433760.

The previous prime is 40642433747. The next prime is 40642433831. The reversal of 40642433761 is 16733424604.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22432550625 + 18209883136 = 149775^2 + 134944^2 .

It is a cyclic number.

It is not a de Polignac number, because 40642433761 - 2⁵ = 40642433729 is a prime.

It is not a weakly prime, because it can be changed into another prime (40642431761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20321216880 + 20321216881.

It is an arithmetic number, because the mean of its divisors is an integer number (20321216881).

Almost surely, 2^40642433761 is an apocalyptic number.

It is an amenable number.

40642433761 is a deficient number, since it is larger than the sum of its proper divisors (1).

40642433761 is an equidigital number, since it uses as much as digits as its factorization.

40642433761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 40.

The spelling of 40642433761 in words is "forty billion, six hundred forty-two million, four hundred thirty-three thousand, seven hundred sixty-one".