6642487963 has 2 divisors, whose sum is σ = 6642487964. Its totient is φ = 6642487962.

The previous prime is 6642487879. The next prime is 6642487997. The reversal of 6642487963 is 3697842466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6642487963 - 2²¹ = 6640390811 is a prime.

It is not a weakly prime, because it can be changed into another prime (6642487063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321243981 + 3321243982.

It is an arithmetic number, because the mean of its divisors is an integer number (3321243982).

Almost surely, 2^6642487963 is an apocalyptic number.

6642487963 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642487963 is an equidigital number, since it uses as much as digits as its factorization.

6642487963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 55.

The square root of 6642487963 is about 81501.4598826303. The cubic root of 6642487963 is about 1879.7939983841.

The spelling of 6642487963 in words is "six billion, six hundred forty-two million, four hundred eighty-seven thousand, nine hundred sixty-three".