6644451461 has 4 divisors (see below), whose sum is σ = 6798973632. Its totient is φ = 6489929292.

The previous prime is 6644451419. The next prime is 6644451469. The reversal of 6644451461 is 1641544466.

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-6644451461 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 (6644451469) 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, 77261021 + ... + 77261106.

It is an arithmetic number, because the mean of its divisors is an integer number (1699743408).

Almost surely, 2^6644451461 is an apocalyptic number.

It is an amenable number.

6644451461 is a deficient number, since it is larger than the sum of its proper divisors (154522171).

6644451461 is a wasteful number, since it uses less digits than its factorization.

6644451461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154522170.

The product of its digits is 276480, while the sum is 41.

The square root of 6644451461 is about 81513.5047768160. The cubic root of 6644451461 is about 1879.9792004829.

The spelling of 6644451461 in words is "six billion, six hundred forty-four million, four hundred fifty-one thousand, four hundred sixty-one".