1644456012164 has 48 divisors (see below), whose sum is σ = 3337028674560. Its totient is φ = 694466831520.

The previous prime is 1644456012107. The next prime is 1644456012167. The reversal of 1644456012164 is 4612106544461.

It is not an unprimeable number, because it can be changed into a prime (1644456012167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3490067 + ... + 3933125.

It is an arithmetic number, because the mean of its divisors is an integer number (69521430720).

Almost surely, 2^{1644456012164} is an apocalyptic number.

1644456012164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1644456012164 is an abundant number, since it is smaller than the sum of its proper divisors (1692572662396).

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

1644456012164 is a wasteful number, since it uses less digits than its factorization.

1644456012164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445008 (or 445006 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 1644456012164 in words is "one trillion, six hundred forty-four billion, four hundred fifty-six million, twelve thousand, one hundred sixty-four".