6640628143 has 2 divisors, whose sum is σ = 6640628144. Its totient is φ = 6640628142.

The previous prime is 6640628129. The next prime is 6640628147. The reversal of 6640628143 is 3418260466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6640628143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6640628096 and 6640628105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6640628147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320314071 + 3320314072.

It is an arithmetic number, because the mean of its divisors is an integer number (3320314072).

Almost surely, 2^6640628143 is an apocalyptic number.

6640628143 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640628143 is an equidigital number, since it uses as much as digits as its factorization.

6640628143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 6640628143 is about 81490.0493495985. The cubic root of 6640628143 is about 1879.6185417965.

It can be divided in two parts, 66406 and 28143, that added together give a palindrome (94549).

The spelling of 6640628143 in words is "six billion, six hundred forty million, six hundred twenty-eight thousand, one hundred forty-three".