1866481775 has 24 divisors (see below), whose sum is σ = 2332216800. Its totient is φ = 1481768960.

The previous prime is 1866481769. The next prime is 1866481787. The reversal of 1866481775 is 5771846681.

It is not a de Polignac number, because 1866481775 - 2¹⁶ = 1866416239 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2884502 + ... + 2885148.

It is an arithmetic number, because the mean of its divisors is an integer number (97175700).

Almost surely, 2^1866481775 is an apocalyptic number.

1866481775 is a deficient number, since it is larger than the sum of its proper divisors (465735025).

1866481775 is a wasteful number, since it uses less digits than its factorization.

1866481775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363 (or 1358 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 53.

The square root of 1866481775 is about 43202.7982311331. The cubic root of 1866481775 is about 1231.2358466770.

The spelling of 1866481775 in words is "one billion, eight hundred sixty-six million, four hundred eighty-one thousand, seven hundred seventy-five".