1643664134577 has 16 divisors (see below), whose sum is σ = 2221625350208. Its totient is φ = 1080740206080.

The previous prime is 1643664134549. The next prime is 1643664134591. The reversal of 1643664134577 is 7754314663461.

It is not a de Polignac number, because 1643664134577 - 2⁷ = 1643664134449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643664134507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16190658 + ... + 16291860.

It is an arithmetic number, because the mean of its divisors is an integer number (138851584388).

Almost surely, 2^{1643664134577} is an apocalyptic number.

It is an amenable number.

1643664134577 is a deficient number, since it is larger than the sum of its proper divisors (577961215631).

1643664134577 is a wasteful number, since it uses less digits than its factorization.

1643664134577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175440.

The product of its digits is 30481920, while the sum is 57.

The spelling of 1643664134577 in words is "one trillion, six hundred forty-three billion, six hundred sixty-four million, one hundred thirty-four thousand, five hundred seventy-seven".