6642556338 has 32 divisors (see below), whose sum is σ = 14546368512. Its totient is φ = 2005462800.

The previous prime is 6642556307. The next prime is 6642556339. The reversal of 6642556338 is 8336552466.

It is not an unprimeable number, because it can be changed into a prime (6642556339) 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, 167806 + ... + 203577.

It is an arithmetic number, because the mean of its divisors is an integer number (454574016).

Almost surely, 2^6642556338 is an apocalyptic number.

6642556338 is an abundant number, since it is smaller than the sum of its proper divisors (7903812174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6642556338 is a wasteful number, since it uses less digits than its factorization.

6642556338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371670.

The product of its digits is 3110400, while the sum is 48.

The square root of 6642556338 is about 81501.8793525646. The cubic root of 6642556338 is about 1879.8004483003.

The spelling of 6642556338 in words is "six billion, six hundred forty-two million, five hundred fifty-six thousand, three hundred thirty-eight".