6642404061 has 4 divisors (see below), whose sum is σ = 8856538752. Its totient is φ = 4428269372.

The previous prime is 6642404051. The next prime is 6642404099. The reversal of 6642404061 is 1604042466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6642404061 - 2⁶ = 6642403997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642404051) 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 3 ways as a sum of consecutive naturals, for example, 1107067341 + ... + 1107067346.

It is an arithmetic number, because the mean of its divisors is an integer number (2214134688).

Almost surely, 2^6642404061 is an apocalyptic number.

It is an amenable number.

6642404061 is a deficient number, since it is larger than the sum of its proper divisors (2214134691).

6642404061 is a wasteful number, since it uses less digits than its factorization.

6642404061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214134690.

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 6642404061 is about 81500.9451540287. The cubic root of 6642404061 is about 1879.7860837221.

The spelling of 6642404061 in words is "six billion, six hundred forty-two million, four hundred four thousand, sixty-one".