40138166473 has 2 divisors, whose sum is σ = 40138166474. Its totient is φ = 40138166472.

The previous prime is 40138166443. The next prime is 40138166527. The reversal of 40138166473 is 37466183104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34689807504 + 5448358969 = 186252^2 + 73813^2 .

It is a cyclic number.

It is not a de Polignac number, because 40138166473 - 2⁹ = 40138165961 is a prime.

It is a super-2 number, since 2×40138166473² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40138166443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069083236 + 20069083237.

It is an arithmetic number, because the mean of its divisors is an integer number (20069083237).

Almost surely, 2^40138166473 is an apocalyptic number.

It is an amenable number.

40138166473 is a deficient number, since it is larger than the sum of its proper divisors (1).

40138166473 is an equidigital number, since it uses as much as digits as its factorization.

40138166473 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 43.

The spelling of 40138166473 in words is "forty billion, one hundred thirty-eight million, one hundred sixty-six thousand, four hundred seventy-three".