40123256317 has 2 divisors, whose sum is σ = 40123256318. Its totient is φ = 40123256316.

The previous prime is 40123256297. The next prime is 40123256323. The reversal of 40123256317 is 71365232104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20596268196 + 19526988121 = 143514^2 + 139739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40123256317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40123256357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20061628158 + 20061628159.

It is an arithmetic number, because the mean of its divisors is an integer number (20061628159).

Almost surely, 2^40123256317 is an apocalyptic number.

It is an amenable number.

40123256317 is a deficient number, since it is larger than the sum of its proper divisors (1).

40123256317 is an equidigital number, since it uses as much as digits as its factorization.

40123256317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 40123256317 in words is "forty billion, one hundred twenty-three million, two hundred fifty-six thousand, three hundred seventeen".