6493961663 has 16 divisors (see below), whose sum is σ = 7457521920. Its totient is φ = 5539418496.

The previous prime is 6493961651. The next prime is 6493961671. The reversal of 6493961663 is 3661693946.

It is a cyclic number.

It is not a de Polignac number, because 6493961663 - 2⁴ = 6493961647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6493961603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2017031 + ... + 2020247.

It is an arithmetic number, because the mean of its divisors is an integer number (466095120).

Almost surely, 2^6493961663 is an apocalyptic number.

6493961663 is a deficient number, since it is larger than the sum of its proper divisors (963560257).

6493961663 is a wasteful number, since it uses less digits than its factorization.

6493961663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4526.

The product of its digits is 3779136, while the sum is 53.

The square root of 6493961663 is about 80585.1206054815. The cubic root of 6493961663 is about 1865.6774978201.

The spelling of 6493961663 in words is "six billion, four hundred ninety-three million, nine hundred sixty-one thousand, six hundred sixty-three".