11956901617 has 2 divisors, whose sum is σ = 11956901618. Its totient is φ = 11956901616.

The previous prime is 11956901599. The next prime is 11956901623. The reversal of 11956901617 is 71610965911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11321811216 + 635090401 = 106404^2 + 25201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11956901617 is a prime.

It is not a weakly prime, because it can be changed into another prime (11956901317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5978450808 + 5978450809.

It is an arithmetic number, because the mean of its divisors is an integer number (5978450809).

Almost surely, 2^11956901617 is an apocalyptic number.

It is an amenable number.

11956901617 is a deficient number, since it is larger than the sum of its proper divisors (1).

11956901617 is an equidigital number, since it uses as much as digits as its factorization.

11956901617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 46.

The spelling of 11956901617 in words is "eleven billion, nine hundred fifty-six million, nine hundred one thousand, six hundred seventeen".