1866853866 has 32 divisors (see below), whose sum is σ = 3757178880. Its totient is φ = 618383664.

The previous prime is 1866853853. The next prime is 1866853867. The reversal of 1866853866 is 6683586681.

It is not an unprimeable number, because it can be changed into a prime (1866853867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1121751 + ... + 1123413.

It is an arithmetic number, because the mean of its divisors is an integer number (117411840).

Almost surely, 2^1866853866 is an apocalyptic number.

1866853866 is an abundant number, since it is smaller than the sum of its proper divisors (1890325014).

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

1866853866 is a wasteful number, since it uses less digits than its factorization.

1866853866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730.

The product of its digits is 9953280, while the sum is 57.

The square root of 1866853866 is about 43207.1043463919. The cubic root of 1866853866 is about 1231.3176585906.

The spelling of 1866853866 in words is "one billion, eight hundred sixty-six million, eight hundred fifty-three thousand, eight hundred sixty-six".