1866109813689 has 32 divisors (see below), whose sum is σ = 2748375318528. Its totient is φ = 1116853400000.

The previous prime is 1866109813663. The next prime is 1866109813697. The reversal of 1866109813689 is 9863189016681.

It is a cyclic number.

It is not a de Polignac number, because 1866109813689 - 2⁸ = 1866109813433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1866109811689) 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, 545614 + ... + 2007464.

It is an arithmetic number, because the mean of its divisors is an integer number (85886728704).

Almost surely, 2^{1866109813689} is an apocalyptic number.

It is an amenable number.

1866109813689 is a deficient number, since it is larger than the sum of its proper divisors (882265504839).

1866109813689 is a wasteful number, since it uses less digits than its factorization.

1866109813689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462349.

The product of its (nonzero) digits is 26873856, while the sum is 66.

The spelling of 1866109813689 in words is "one trillion, eight hundred sixty-six billion, one hundred nine million, eight hundred thirteen thousand, six hundred eighty-nine".