6642032891 has 16 divisors (see below), whose sum is σ = 7229930400. Its totient is φ = 6065488128.

The previous prime is 6642032879. The next prime is 6642032899. The reversal of 6642032891 is 1982302466.

It is a cyclic number.

It is not a de Polignac number, because 6642032891 - 2⁶ = 6642032827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6642032899) 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 15 ways as a sum of consecutive naturals, for example, 451175 + ... + 465663.

It is an arithmetic number, because the mean of its divisors is an integer number (451870650).

Almost surely, 2^6642032891 is an apocalyptic number.

6642032891 is a deficient number, since it is larger than the sum of its proper divisors (587897509).

6642032891 is a wasteful number, since it uses less digits than its factorization.

6642032891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14878.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 6642032891 is about 81498.6680320605. The cubic root of 6642032891 is about 1879.7510696323.

The spelling of 6642032891 in words is "six billion, six hundred forty-two million, thirty-two thousand, eight hundred ninety-one".