1644064140453 has 48 divisors (see below), whose sum is σ = 2573759238336. Its totient is φ = 930711237120.

The previous prime is 1644064140449. The next prime is 1644064140463. The reversal of 1644064140453 is 3540414604461.

It is a happy number.

It is not a de Polignac number, because 1644064140453 - 2² = 1644064140449 is a prime.

It is a super-3 number, since 3×1644064140453³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644064140463) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36870750 + ... + 36915312.

It is an arithmetic number, because the mean of its divisors is an integer number (53619984132).

Almost surely, 2^{1644064140453} is an apocalyptic number.

It is an amenable number.

1644064140453 is a deficient number, since it is larger than the sum of its proper divisors (929695097883).

1644064140453 is a wasteful number, since it uses less digits than its factorization.

1644064140453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46914 (or 46907 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 42.

The spelling of 1644064140453 in words is "one trillion, six hundred forty-four billion, sixty-four million, one hundred forty thousand, four hundred fifty-three".