1644764645114 has 4 divisors (see below), whose sum is σ = 2467146967674. Its totient is φ = 822382322556.

The previous prime is 1644764645039. The next prime is 1644764645131. The reversal of 1644764645114 is 4115464674461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1568017362025 + 76747283089 = 1252205^2 + 277033^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411191161277 + ... + 411191161280.

Almost surely, 2^{1644764645114} is an apocalyptic number.

1644764645114 is a deficient number, since it is larger than the sum of its proper divisors (822382322560).

1644764645114 is an equidigital number, since it uses as much as digits as its factorization.

1644764645114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822382322559.

The product of its digits is 7741440, while the sum is 53.

The spelling of 1644764645114 in words is "one trillion, six hundred forty-four billion, seven hundred sixty-four million, six hundred forty-five thousand, one hundred fourteen".