5451840666 has 24 divisors (see below), whose sum is σ = 11819988180. Its totient is φ = 1816100736.

The previous prime is 5451840649. The next prime is 5451840689. The reversal of 5451840666 is 6660481545.

It can be written as a sum of positive squares in 2 ways, for example, as 4680612225 + 771228441 = 68415^2 + 27771^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69561 + ... + 125468.

Almost surely, 2^5451840666 is an apocalyptic number.

5451840666 is an abundant number, since it is smaller than the sum of its proper divisors (6368147514).

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

5451840666 is a wasteful number, since it uses less digits than its factorization.

5451840666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196590 (or 196587 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 5451840666 is about 73836.5808119526. The cubic root of 5451840666 is about 1760.0069586932.

The spelling of 5451840666 in words is "five billion, four hundred fifty-one million, eight hundred forty thousand, six hundred sixty-six".