6644121701 has 4 divisors (see below), whose sum is σ = 7593281952. Its totient is φ = 5694961452.

The previous prime is 6644121667. The next prime is 6644121707. The reversal of 6644121701 is 1071214466.

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 a de Polignac number, because none of the positive numbers 2^k-6644121701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644121707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474580115 + ... + 474580128.

It is an arithmetic number, because the mean of its divisors is an integer number (1898320488).

Almost surely, 2^6644121701 is an apocalyptic number.

It is an amenable number.

6644121701 is a deficient number, since it is larger than the sum of its proper divisors (949160251).

6644121701 is an equidigital number, since it uses as much as digits as its factorization.

6644121701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949160250.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 6644121701 is about 81511.4820194063. The cubic root of 6644121701 is about 1879.9480992349.

The spelling of 6644121701 in words is "six billion, six hundred forty-four million, one hundred twenty-one thousand, seven hundred one".