20173465643 has 2 divisors, whose sum is σ = 20173465644. Its totient is φ = 20173465642.

The previous prime is 20173465621. The next prime is 20173465657. The reversal of 20173465643 is 34656437102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20173465643 - 2⁸ = 20173465387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20173465643.

It is not a weakly prime, because it can be changed into another prime (20173465603) 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, 10086732821 + 10086732822.

It is an arithmetic number, because the mean of its divisors is an integer number (10086732822).

Almost surely, 2^20173465643 is an apocalyptic number.

20173465643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20173465643 is an equidigital number, since it uses as much as digits as its factorization.

20173465643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 20173465643 in words is "twenty billion, one hundred seventy-three million, four hundred sixty-five thousand, six hundred forty-three".