1866851852055 has 32 divisors (see below), whose sum is σ = 3090074961600. Its totient is φ = 961286172672.

The previous prime is 1866851852053. The next prime is 1866851852069. The reversal of 1866851852055 is 5502581586681.

It is not a de Polignac number, because 1866851852055 - 2¹ = 1866851852053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1866851852055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866851852051) 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, 15214791 + ... + 15336999.

It is an arithmetic number, because the mean of its divisors is an integer number (96564842550).

Almost surely, 2^{1866851852055} is an apocalyptic number.

1866851852055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1866851852055 is a deficient number, since it is larger than the sum of its proper divisors (1223223109545).

1866851852055 is a wasteful number, since it uses less digits than its factorization.

1866851852055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157363.

The product of its (nonzero) digits is 23040000, while the sum is 60.

The spelling of 1866851852055 in words is "one trillion, eight hundred sixty-six billion, eight hundred fifty-one million, eight hundred fifty-two thousand, fifty-five".