64448453689 has 3 divisors (see below), whose sum is σ = 64448707557. Its totient is φ = 64448199822.

The previous prime is 64448453603. The next prime is 64448453767. The reversal of 64448453689 is 98635484446.

It is a happy number.

The square root of 64448453689 is 253867.

It is a perfect power (a square), and thus also a powerful number.

64448453689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 64448453689 - 2¹³ = 64448445497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64448453089) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 126934 + ... + 380800.

It is an arithmetic number, because the mean of its divisors is an integer number (21482902519).

Almost surely, 2^64448453689 is an apocalyptic number.

64448453689 is the 253867-th square number.

64448453689 is the 126934-th centered octagonal number.

It is an amenable number.

64448453689 is a deficient number, since it is larger than the sum of its proper divisors (253868).

64448453689 is an frugal number, since it uses more digits than its factorization.

64448453689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507734 (or 253867 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 61.

The spelling of 64448453689 in words is "sixty-four billion, four hundred forty-eight million, four hundred fifty-three thousand, six hundred eighty-nine".