40271256661 has 2 divisors, whose sum is σ = 40271256662. Its totient is φ = 40271256660.

The previous prime is 40271256631. The next prime is 40271256709. The reversal of 40271256661 is 16665217204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29868480625 + 10402776036 = 172825^2 + 101994^2 .

It is a cyclic number.

It is not a de Polignac number, because 40271256661 - 2⁷ = 40271256533 is a prime.

It is a super-2 number, since 2×40271256661² (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 (40271256601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20135628330 + 20135628331.

It is an arithmetic number, because the mean of its divisors is an integer number (20135628331).

Almost surely, 2^40271256661 is an apocalyptic number.

It is an amenable number.

40271256661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40271256661 is an equidigital number, since it uses as much as digits as its factorization.

40271256661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 40271256661 in words is "forty billion, two hundred seventy-one million, two hundred fifty-six thousand, six hundred sixty-one".