20173465657 has 2 divisors, whose sum is σ = 20173465658. Its totient is φ = 20173465656.

The previous prime is 20173465643. The next prime is 20173465661. The reversal of 20173465657 is 75656437102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13238573481 + 6934892176 = 115059^2 + 83276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20173465657 is a prime.

It is a super-2 number, since 2×20173465657² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20173465607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10086732828 + 10086732829.

It is an arithmetic number, because the mean of its divisors is an integer number (10086732829).

Almost surely, 2^20173465657 is an apocalyptic number.

It is an amenable number.

20173465657 is a deficient number, since it is larger than the sum of its proper divisors (1).

20173465657 is an equidigital number, since it uses as much as digits as its factorization.

20173465657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 20173465657 in words is "twenty billion, one hundred seventy-three million, four hundred sixty-five thousand, six hundred fifty-seven".