1866549846858 has 16 divisors (see below), whose sum is σ = 3733173348960. Its totient is φ = 622171006416.

The previous prime is 1866549846857. The next prime is 1866549846859. The reversal of 1866549846858 is 8586489456681.

It is an interprime number because it is at equal distance from previous prime (1866549846857) and next prime (1866549846859).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1866549846857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2736760 + ... + 3350067.

It is an arithmetic number, because the mean of its divisors is an integer number (233323334310).

Almost surely, 2^{1866549846858} is an apocalyptic number.

1866549846858 is an abundant number, since it is smaller than the sum of its proper divisors (1866623502102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1866549846858 is a wasteful number, since it uses less digits than its factorization.

1866549846858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6137941.

The product of its digits is 3185049600, while the sum is 78.

The spelling of 1866549846858 in words is "one trillion, eight hundred sixty-six billion, five hundred forty-nine million, eight hundred forty-six thousand, eight hundred fifty-eight".