3945792729181 has 2 divisors, whose sum is σ = 3945792729182. Its totient is φ = 3945792729180.

The previous prime is 3945792729161. The next prime is 3945792729251. The reversal of 3945792729181 is 1819272975493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3856785376900 + 89007352281 = 1963870^2 + 298341^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945792729181 - 2⁵ = 3945792729149 is a prime.

It is a super-2 number, since 2×3945792729181² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3945792729161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972896364590 + 1972896364591.

It is an arithmetic number, because the mean of its divisors is an integer number (1972896364591).

Almost surely, 2^{3945792729181} is an apocalyptic number.

It is an amenable number.

3945792729181 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945792729181 is an equidigital number, since it uses as much as digits as its factorization.

3945792729181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68584320, while the sum is 67.

The spelling of 3945792729181 in words is "three trillion, nine hundred forty-five billion, seven hundred ninety-two million, seven hundred twenty-nine thousand, one hundred eighty-one".