6642631001 has 4 divisors (see below), whose sum is σ = 6644722404. Its totient is φ = 6640539600.

The previous prime is 6642630997. The next prime is 6642631057. The reversal of 6642631001 is 1001362466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4166573401 + 2476057600 = 64549^2 + 49760^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642631001 - 2² = 6642630997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6642633001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1040930 + ... + 1047291.

It is an arithmetic number, because the mean of its divisors is an integer number (1661180601).

Almost surely, 2^6642631001 is an apocalyptic number.

It is an amenable number.

6642631001 is a deficient number, since it is larger than the sum of its proper divisors (2091403).

6642631001 is a wasteful number, since it uses less digits than its factorization.

6642631001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091402.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 6642631001 is about 81502.3373959299. The cubic root of 6642631001 is about 1879.8074913225.

Adding to 6642631001 its reverse (1001362466), we get a palindrome (7643993467).

The spelling of 6642631001 in words is "six billion, six hundred forty-two million, six hundred thirty-one thousand, one".