9145447921657 has 2 divisors, whose sum is σ = 9145447921658. Its totient is φ = 9145447921656.

The previous prime is 9145447921591. The next prime is 9145447921679. The reversal of 9145447921657 is 7561297445419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5999971866256 + 3145476055401 = 2449484^2 + 1773549^2 .

It is a cyclic number.

It is not a de Polignac number, because 9145447921657 - 2¹⁹ = 9145447397369 is a prime.

It is not a weakly prime, because it can be changed into another prime (9145447931657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4572723960828 + 4572723960829.

It is an arithmetic number, because the mean of its divisors is an integer number (4572723960829).

Almost surely, 2^{9145447921657} is an apocalyptic number.

It is an amenable number.

9145447921657 is a deficient number, since it is larger than the sum of its proper divisors (1).

9145447921657 is an equidigital number, since it uses as much as digits as its factorization.

9145447921657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76204800, while the sum is 64.

The spelling of 9145447921657 in words is "nine trillion, one hundred forty-five billion, four hundred forty-seven million, nine hundred twenty-one thousand, six hundred fifty-seven".