638298732143 has 2 divisors, whose sum is σ = 638298732144. Its totient is φ = 638298732142.

The previous prime is 638298732053. The next prime is 638298732157. The reversal of 638298732143 is 341237892836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638298732143 - 2³² = 634003764847 is a prime.

It is a super-2 number, since 2×638298732143² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638298732443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319149366071 + 319149366072.

It is an arithmetic number, because the mean of its divisors is an integer number (319149366072).

Almost surely, 2^638298732143 is an apocalyptic number.

638298732143 is a deficient number, since it is larger than the sum of its proper divisors (1).

638298732143 is an equidigital number, since it uses as much as digits as its factorization.

638298732143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 56.

The spelling of 638298732143 in words is "six hundred thirty-eight billion, two hundred ninety-eight million, seven hundred thirty-two thousand, one hundred forty-three".