6642038173 has 2 divisors, whose sum is σ = 6642038174. Its totient is φ = 6642038172.

The previous prime is 6642038153. The next prime is 6642038177. The reversal of 6642038173 is 3718302466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5532681924 + 1109356249 = 74382^2 + 33307^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642038173 - 2¹⁷ = 6641907101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6642038177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321019086 + 3321019087.

It is an arithmetic number, because the mean of its divisors is an integer number (3321019087).

Almost surely, 2^6642038173 is an apocalyptic number.

It is an amenable number.

6642038173 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642038173 is an equidigital number, since it uses as much as digits as its factorization.

6642038173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 6642038173 is about 81498.7004374916. The cubic root of 6642038173 is about 1879.7515679156.

The spelling of 6642038173 in words is "six billion, six hundred forty-two million, thirty-eight thousand, one hundred seventy-three".