40255705397 has 2 divisors, whose sum is σ = 40255705398. Its totient is φ = 40255705396.

The previous prime is 40255705381. The next prime is 40255705409. The reversal of 40255705397 is 79350755204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39890475076 + 365230321 = 199726^2 + 19111^2 .

It is a cyclic number.

It is not a de Polignac number, because 40255705397 - 2⁴ = 40255705381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40255705367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20127852698 + 20127852699.

It is an arithmetic number, because the mean of its divisors is an integer number (20127852699).

Almost surely, 2^40255705397 is an apocalyptic number.

It is an amenable number.

40255705397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40255705397 is an equidigital number, since it uses as much as digits as its factorization.

40255705397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1323000, while the sum is 47.

The spelling of 40255705397 in words is "forty billion, two hundred fifty-five million, seven hundred five thousand, three hundred ninety-seven".