1866640104826 has 16 divisors (see below), whose sum is σ = 3213688181184. Its totient is φ = 796555187424.

The previous prime is 1866640104793. The next prime is 1866640104827. The reversal of 1866640104826 is 6284010466681.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1866640104827) 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, 286115700 + ... + 286122223.

It is an arithmetic number, because the mean of its divisors is an integer number (200855511324).

Almost surely, 2^{1866640104826} is an apocalyptic number.

1866640104826 is a deficient number, since it is larger than the sum of its proper divisors (1347048076358).

1866640104826 is a wasteful number, since it uses less digits than its factorization.

1866640104826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572238165.

The product of its (nonzero) digits is 2654208, while the sum is 52.

The spelling of 1866640104826 in words is "one trillion, eight hundred sixty-six billion, six hundred forty million, one hundred four thousand, eight hundred twenty-six".