40165781423 has 2 divisors, whose sum is σ = 40165781424. Its totient is φ = 40165781422.

The previous prime is 40165781419. The next prime is 40165781477. The reversal of 40165781423 is 32418756104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40165781423 - 2² = 40165781419 is a prime.

It is a super-2 number, since 2×40165781423² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40165781923) 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, 20082890711 + 20082890712.

It is an arithmetic number, because the mean of its divisors is an integer number (20082890712).

Almost surely, 2^40165781423 is an apocalyptic number.

40165781423 is a deficient number, since it is larger than the sum of its proper divisors (1).

40165781423 is an equidigital number, since it uses as much as digits as its factorization.

40165781423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 40165781423 in words is "forty billion, one hundred sixty-five million, seven hundred eighty-one thousand, four hundred twenty-three".