1664127902873 has 8 divisors (see below), whose sum is σ = 1691865931656. Its totient is φ = 1636404624000.

The previous prime is 1664127902867. The next prime is 1664127902887. The reversal of 1664127902873 is 3782097214661.

It can be written as a sum of positive squares in 4 ways, for example, as 18634161049 + 1645493741824 = 136507^2 + 1282768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664127902873 - 2⁶ = 1664127902809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664127901873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3459836 + ... + 3911357.

It is an arithmetic number, because the mean of its divisors is an integer number (211483241457).

Almost surely, 2^{1664127902873} is an apocalyptic number.

It is an amenable number.

1664127902873 is a deficient number, since it is larger than the sum of its proper divisors (27738028783).

1664127902873 is an equidigital number, since it uses as much as digits as its factorization.

1664127902873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374955.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 1664127902873 in words is "one trillion, six hundred sixty-four billion, one hundred twenty-seven million, nine hundred two thousand, eight hundred seventy-three".