1644405000668 has 12 divisors (see below), whose sum is σ = 2881257103032. Its totient is φ = 821188685520.

The previous prime is 1644405000643. The next prime is 1644405000671. The reversal of 1644405000668 is 8660005044461.

It is a super-3 number, since 3×1644405000668³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253450055 + ... + 253456542.

It is an arithmetic number, because the mean of its divisors is an integer number (240104758586).

Almost surely, 2^{1644405000668} is an apocalyptic number.

It is an amenable number.

1644405000668 is a deficient number, since it is larger than the sum of its proper divisors (1236852102364).

1644405000668 is a wasteful number, since it uses less digits than its factorization.

1644405000668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506907412 (or 506907410 counting only the distinct ones).

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

The spelling of 1644405000668 in words is "one trillion, six hundred forty-four billion, four hundred five million, six hundred sixty-eight", and thus it is an aban number.