5644421022665 has 4 divisors (see below), whose sum is σ = 6773305227204. Its totient is φ = 4515536818128.

The previous prime is 5644421022661. The next prime is 5644421022703. The reversal of 5644421022665 is 5662201244465.

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 1762744803856 + 3881676218809 = 1327684^2 + 1970197^2 .

It is a cyclic number.

It is not a de Polignac number, because 5644421022665 - 2² = 5644421022661 is a prime.

It is a super-2 number, since 2×5644421022665² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5644421022661) 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, 564442102262 + ... + 564442102271.

It is an arithmetic number, because the mean of its divisors is an integer number (1693326306801).

Almost surely, 2^{5644421022665} is an apocalyptic number.

It is an amenable number.

5644421022665 is a deficient number, since it is larger than the sum of its proper divisors (1128884204539).

5644421022665 is a wasteful number, since it uses less digits than its factorization.

5644421022665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128884204538.

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 5644421022665 in words is "five trillion, six hundred forty-four billion, four hundred twenty-one million, twenty-two thousand, six hundred sixty-five".