1640869187875 has 32 divisors (see below), whose sum is σ = 2123176273920. Its totient is φ = 1264753404000.

The previous prime is 1640869187851. The next prime is 1640869187879. The reversal of 1640869187875 is 5787819680461.

It is not a de Polignac number, because 1640869187875 - 2¹³ = 1640869179683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640869187879) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53085 + ... + 1812334.

It is an arithmetic number, because the mean of its divisors is an integer number (66349258560).

Almost surely, 2^{1640869187875} is an apocalyptic number.

1640869187875 is a deficient number, since it is larger than the sum of its proper divisors (482307086045).

1640869187875 is a wasteful number, since it uses less digits than its factorization.

1640869187875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865692 (or 1865682 counting only the distinct ones).

The product of its (nonzero) digits is 162570240, while the sum is 70.

The spelling of 1640869187875 in words is "one trillion, six hundred forty billion, eight hundred sixty-nine million, one hundred eighty-seven thousand, eight hundred seventy-five".