6638252251 has 6 divisors (see below), whose sum is σ = 6822514860. Its totient is φ = 6458838696.

The previous prime is 6638252233. The next prime is 6638252263. The reversal of 6638252251 is 1522528366.

It is a happy number.

It is not a de Polignac number, because 6638252251 - 2⁵ = 6638252219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6638252351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2423121 + ... + 2425858.

It is an arithmetic number, because the mean of its divisors is an integer number (1137085810).

Almost surely, 2^6638252251 is an apocalyptic number.

6638252251 is a deficient number, since it is larger than the sum of its proper divisors (184262609).

6638252251 is an equidigital number, since it uses as much as digits as its factorization.

6638252251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4849053 (or 4849016 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 6638252251 is about 81475.4702410486. The cubic root of 6638252251 is about 1879.3943509893.

The spelling of 6638252251 in words is "six billion, six hundred thirty-eight million, two hundred fifty-two thousand, two hundred fifty-one".