6644142361 has 4 divisors (see below), whose sum is σ = 6712638772. Its totient is φ = 6575645952.

The previous prime is 6644142359. The next prime is 6644142403. The reversal of 6644142361 is 1632414466.

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 995718025 + 5648424336 = 31555^2 + 75156^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644142361 - 2¹ = 6644142359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6644142361.

It is not an unprimeable number, because it can be changed into a prime (6644142311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34248060 + ... + 34248253.

It is an arithmetic number, because the mean of its divisors is an integer number (1678159693).

Almost surely, 2^6644142361 is an apocalyptic number.

It is an amenable number.

6644142361 is a deficient number, since it is larger than the sum of its proper divisors (68496411).

6644142361 is an equidigital number, since it uses as much as digits as its factorization.

6644142361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68496410.

The product of its digits is 82944, while the sum is 37.

The square root of 6644142361 is about 81511.6087499198. The cubic root of 6644142361 is about 1879.9500478089.

The spelling of 6644142361 in words is "six billion, six hundred forty-four million, one hundred forty-two thousand, three hundred sixty-one".