11657274721 has 2 divisors, whose sum is σ = 11657274722. Its totient is φ = 11657274720.

The previous prime is 11657274709. The next prime is 11657274767. The reversal of 11657274721 is 12747275611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10254397696 + 1402877025 = 101264^2 + 37455^2 .

It is a cyclic number.

It is not a de Polignac number, because 11657274721 - 2¹³ = 11657266529 is a prime.

It is not a weakly prime, because it can be changed into another prime (11657274791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5828637360 + 5828637361.

It is an arithmetic number, because the mean of its divisors is an integer number (5828637361).

Almost surely, 2^11657274721 is an apocalyptic number.

It is an amenable number.

11657274721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11657274721 is an equidigital number, since it uses as much as digits as its factorization.

11657274721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 43.

The spelling of 11657274721 in words is "eleven billion, six hundred fifty-seven million, two hundred seventy-four thousand, seven hundred twenty-one".