1866773441 has 4 divisors (see below), whose sum is σ = 2010371412. Its totient is φ = 1723175472.

The previous prime is 1866773353. The next prime is 1866773477. The reversal of 1866773441 is 1443776681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 764799025 + 1101974416 = 27655^2 + 33196^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866773441 - 2¹⁰ = 1866772417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866773641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71798966 + ... + 71798991.

It is an arithmetic number, because the mean of its divisors is an integer number (502592853).

Almost surely, 2^1866773441 is an apocalyptic number.

It is an amenable number.

1866773441 is a deficient number, since it is larger than the sum of its proper divisors (143597971).

1866773441 is a wasteful number, since it uses less digits than its factorization.

1866773441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143597970.

The product of its digits is 677376, while the sum is 47.

The square root of 1866773441 is about 43206.1736445152. The cubic root of 1866773441 is about 1231.2999764094.

The spelling of 1866773441 in words is "one billion, eight hundred sixty-six million, seven hundred seventy-three thousand, four hundred forty-one".