6598638887 has 2 divisors, whose sum is σ = 6598638888. Its totient is φ = 6598638886.

The previous prime is 6598638869. The next prime is 6598638919. The reversal of 6598638887 is 7888368956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6598638887 - 2²² = 6594444583 is a prime.

It is a super-2 number, since 2×6598638887² = 87084070322057197538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6598638817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3299319443 + 3299319444.

It is an arithmetic number, because the mean of its divisors is an integer number (3299319444).

Almost surely, 2^6598638887 is an apocalyptic number.

6598638887 is a deficient number, since it is larger than the sum of its proper divisors (1).

6598638887 is an equidigital number, since it uses as much as digits as its factorization.

6598638887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139345920, while the sum is 68.

The square root of 6598638887 is about 81232.0065429877. The cubic root of 6598638887 is about 1875.6484997805.

The spelling of 6598638887 in words is "six billion, five hundred ninety-eight million, six hundred thirty-eight thousand, eight hundred eighty-seven".