64544644545 has 32 divisors (see below), whose sum is σ = 108777513600. Its totient is φ = 32590808064.

The previous prime is 64544644537. The next prime is 64544644553. The reversal of 64544644545 is 54544644546.

It is an interprime number because it is at equal distance from previous prime (64544644537) and next prime (64544644553).

It is not a de Polignac number, because 64544644545 - 2³ = 64544644537 is a prime.

It is a super-2 number, since 2×64544644545² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 369691 + ... + 515519.

It is an arithmetic number, because the mean of its divisors is an integer number (3399297300).

Almost surely, 2^64544644545 is an apocalyptic number.

It is an amenable number.

64544644545 is a deficient number, since it is larger than the sum of its proper divisors (44232869055).

64544644545 is a wasteful number, since it uses less digits than its factorization.

64544644545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147409.

The product of its digits is 18432000, while the sum is 51.

Subtracting from 64544644545 its reverse (54544644546), we obtain a palindrome (9999999999).

The spelling of 64544644545 in words is "sixty-four billion, five hundred forty-four million, six hundred forty-four thousand, five hundred forty-five".