8440644446664 has 32 divisors (see below), whose sum is σ = 21106474620000. Its totient is φ = 2812899681792.

The previous prime is 8440644446629. The next prime is 8440644446677. The reversal of 8440644446664 is 4666444460448.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 8440644446598 and 8440644446607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40422889 + ... + 40631160.

It is an arithmetic number, because the mean of its divisors is an integer number (659577331875).

Almost surely, 2^{8440644446664} is an apocalyptic number.

It is an amenable number.

8440644446664 is an abundant number, since it is smaller than the sum of its proper divisors (12665830173336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8440644446664 is a wasteful number, since it uses less digits than its factorization.

8440644446664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81058397 (or 81058393 counting only the distinct ones).

The product of its (nonzero) digits is 169869312, while the sum is 60.

The spelling of 8440644446664 in words is "eight trillion, four hundred forty billion, six hundred forty-four million, four hundred forty-six thousand, six hundred sixty-four".