1643664134576 has 40 divisors (see below), whose sum is σ = 3367507049088. Its totient is φ = 775923264000.

The previous prime is 1643664134549. The next prime is 1643664134591. The reversal of 1643664134576 is 6754314663461.

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, 40392335 + ... + 40433006.

Almost surely, 2^{1643664134576} is an apocalyptic number.

1643664134576 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1643664134576 is an abundant number, since it is smaller than the sum of its proper divisors (1723842914512).

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

1643664134576 is a wasteful number, since it uses less digits than its factorization.

1643664134576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80825421 (or 80825415 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 56.

The spelling of 1643664134576 in words is "one trillion, six hundred forty-three billion, six hundred sixty-four million, one hundred thirty-four thousand, five hundred seventy-six".