1644528872747 has 2 divisors, whose sum is σ = 1644528872748. Its totient is φ = 1644528872746.

The previous prime is 1644528872731. The next prime is 1644528872761. The reversal of 1644528872747 is 7472788254461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1644528872747 - 2⁴ = 1644528872731 is a prime.

It is not a weakly prime, because it can be changed into another prime (1644528872717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822264436373 + 822264436374.

It is an arithmetic number, because the mean of its divisors is an integer number (822264436374).

Almost surely, 2^{1644528872747} is an apocalyptic number.

1644528872747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644528872747 is an equidigital number, since it uses as much as digits as its factorization.

1644528872747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168591360, while the sum is 65.

The spelling of 1644528872747 in words is "one trillion, six hundred forty-four billion, five hundred twenty-eight million, eight hundred seventy-two thousand, seven hundred forty-seven".