6638772833 has 32 divisors (see below), whose sum is σ = 8822089728. Its totient is φ = 4836384000.

The previous prime is 6638772827. The next prime is 6638772839. The reversal of 6638772833 is 3382778366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6638772827) and next prime (6638772839).

It is not a de Polignac number, because 6638772833 - 2¹⁸ = 6638510689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6638772839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180866 + ... + 214452.

It is an arithmetic number, because the mean of its divisors is an integer number (275690304).

Almost surely, 2^6638772833 is an apocalyptic number.

It is an amenable number.

6638772833 is a deficient number, since it is larger than the sum of its proper divisors (2183316895).

6638772833 is a wasteful number, since it uses less digits than its factorization.

6638772833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33773.

The product of its digits is 6096384, while the sum is 53.

The square root of 6638772833 is about 81478.6648945600. The cubic root of 6638772833 is about 1879.4434780416.

The spelling of 6638772833 in words is "six billion, six hundred thirty-eight million, seven hundred seventy-two thousand, eight hundred thirty-three".