40181772637 has 2 divisors, whose sum is σ = 40181772638. Its totient is φ = 40181772636.

The previous prime is 40181772629. The next prime is 40181772689. The reversal of 40181772637 is 73627718104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38107334521 + 2074438116 = 195211^2 + 45546^2 .

It is a cyclic number.

It is not a de Polignac number, because 40181772637 - 2³ = 40181772629 is a prime.

It is a super-2 number, since 2×40181772637² (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 (40181772437) 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, 20090886318 + 20090886319.

It is an arithmetic number, because the mean of its divisors is an integer number (20090886319).

Almost surely, 2^40181772637 is an apocalyptic number.

It is an amenable number.

40181772637 is a deficient number, since it is larger than the sum of its proper divisors (1).

40181772637 is an equidigital number, since it uses as much as digits as its factorization.

40181772637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 40181772637 in words is "forty billion, one hundred eighty-one million, seven hundred seventy-two thousand, six hundred thirty-seven".