5644162721 has 2 divisors, whose sum is σ = 5644162722. Its totient is φ = 5644162720.

The previous prime is 5644162709. The next prime is 5644162739. The reversal of 5644162721 is 1272614465.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4158831121 + 1485331600 = 64489^2 + 38540^2 .

It is a cyclic number.

It is not a de Polignac number, because 5644162721 - 2¹⁰ = 5644161697 is a prime.

It is a super-2 number, since 2×5644162721² = 63713145642252247682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5644162421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822081360 + 2822081361.

It is an arithmetic number, because the mean of its divisors is an integer number (2822081361).

Almost surely, 2^5644162721 is an apocalyptic number.

It is an amenable number.

5644162721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5644162721 is an equidigital number, since it uses as much as digits as its factorization.

5644162721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 5644162721 is about 75127.6428553432. The cubic root of 5644162721 is about 1780.4639115072.

The spelling of 5644162721 in words is "five billion, six hundred forty-four million, one hundred sixty-two thousand, seven hundred twenty-one".