1866275138905 has 8 divisors (see below), whose sum is σ = 2239715370312. Its totient is φ = 1492896642048.

The previous prime is 1866275138899. The next prime is 1866275138953. The reversal of 1866275138905 is 5098315726681.

It can be written as a sum of positive squares in 4 ways, for example, as 31255411264 + 1835019727641 = 176792^2 + 1354629^2 .

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 1866275138905 - 2²³ = 1866266750297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15367102 + ... + 15488071.

It is an arithmetic number, because the mean of its divisors is an integer number (279964421289).

Almost surely, 2^{1866275138905} is an apocalyptic number.

It is an amenable number.

1866275138905 is a deficient number, since it is larger than the sum of its proper divisors (373440231407).

1866275138905 is a wasteful number, since it uses less digits than its factorization.

1866275138905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30867275.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 1866275138905 in words is "one trillion, eight hundred sixty-six billion, two hundred seventy-five million, one hundred thirty-eight thousand, nine hundred five".