7171921770457 has 2 divisors, whose sum is σ = 7171921770458. Its totient is φ = 7171921770456.

The previous prime is 7171921770439. The next prime is 7171921770467. The reversal of 7171921770457 is 7540771291717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6695772089161 + 476149681296 = 2587619^2 + 690036^2 .

It is a cyclic number.

It is not a de Polignac number, because 7171921770457 - 2²³ = 7171913381849 is a prime.

It is not a weakly prime, because it can be changed into another prime (7171921770467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3585960885228 + 3585960885229.

It is an arithmetic number, because the mean of its divisors is an integer number (3585960885229).

Almost surely, 2^{7171921770457} is an apocalyptic number.

It is an amenable number.

7171921770457 is a deficient number, since it is larger than the sum of its proper divisors (1).

7171921770457 is an equidigital number, since it uses as much as digits as its factorization.

7171921770457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6050520, while the sum is 58.

The spelling of 7171921770457 in words is "seven trillion, one hundred seventy-one billion, nine hundred twenty-one million, seven hundred seventy thousand, four hundred fifty-seven".