9426809866657 has 2 divisors, whose sum is σ = 9426809866658. Its totient is φ = 9426809866656.

The previous prime is 9426809866651. The next prime is 9426809866693. The reversal of 9426809866657 is 7566689086249.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8760155579536 + 666654287121 = 2959756^2 + 816489^2 .

It is a cyclic number.

It is not a de Polignac number, because 9426809866657 - 2²³ = 9426801478049 is a prime.

It is a super-2 number, since 2×9426809866657² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9426809866651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4713404933328 + 4713404933329.

It is an arithmetic number, because the mean of its divisors is an integer number (4713404933329).

Almost surely, 2^{9426809866657} is an apocalyptic number.

It is an amenable number.

9426809866657 is a deficient number, since it is larger than the sum of its proper divisors (1).

9426809866657 is an equidigital number, since it uses as much as digits as its factorization.

9426809866657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1881169920, while the sum is 76.

The spelling of 9426809866657 in words is "nine trillion, four hundred twenty-six billion, eight hundred nine million, eight hundred sixty-six thousand, six hundred fifty-seven".