64440433404446 has 12 divisors (see below), whose sum is σ = 106246830282936. Its totient is φ = 29291106092820.

The previous prime is 64440433404443. The next prime is 64440433404469.

64440433404446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 64440433404394 and 64440433404403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440433404443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133141391090 + ... + 133141391573.

It is an arithmetic number, because the mean of its divisors is an integer number (8853902523578).

Almost surely, 2^{64440433404446} is an apocalyptic number.

64440433404446 is a deficient number, since it is larger than the sum of its proper divisors (41806396878490).

64440433404446 is a wasteful number, since it uses less digits than its factorization.

64440433404446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266282782687 (or 266282782676 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 50.

It can be divided in two parts, 6444043 and 3404446, that added together give a palindrome (9848489).

The spelling of 64440433404446 in words is "sixty-four trillion, four hundred forty billion, four hundred thirty-three million, four hundred four thousand, four hundred forty-six".