64544445354451 has 4 divisors (see below), whose sum is σ = 64544503464504. Its totient is φ = 64544387244400.

The previous prime is 64544445354449. The next prime is 64544445354497. The reversal of 64544445354451 is 15445354444546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64544445354451 - 2¹ = 64544445354449 is a prime.

It is a super-4 number, since 4×64544445354451⁴ (a number of 56 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64544445334451) 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, 27355810 + ... + 29621431.

It is an arithmetic number, because the mean of its divisors is an integer number (16136125866126).

Almost surely, 2^{64544445354451} is an apocalyptic number.

64544445354451 is a deficient number, since it is larger than the sum of its proper divisors (58110053).

64544445354451 is a wasteful number, since it uses less digits than its factorization.

64544445354451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58110052.

The product of its digits is 184320000, while the sum is 58.

Adding to 64544445354451 its reverse (15445354444546), we get a palindrome (79989799798997).

The spelling of 64544445354451 in words is "sixty-four trillion, five hundred forty-four billion, four hundred forty-five million, three hundred fifty-four thousand, four hundred fifty-one".