51668801 has 4 divisors (see below), whose sum is σ = 51723972. Its totient is φ = 51613632.

The previous prime is 51668791. The next prime is 51668819. The reversal of 51668801 is 10886615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10886615 = 5 ⋅2177323.

It can be written as a sum of positive squares in 2 ways, for example, as 12418576 + 39250225 = 3524^2 + 6265^2 .

It is a cyclic number.

It is not a de Polignac number, because 51668801 - 2⁶ = 51668737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51668501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26156 + ... + 28061.

It is an arithmetic number, because the mean of its divisors is an integer number (12930993).

Almost surely, 2^51668801 is an apocalyptic number.

It is an amenable number.

51668801 is a deficient number, since it is larger than the sum of its proper divisors (55171).

51668801 is an equidigital number, since it uses as much as digits as its factorization.

51668801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55170.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 51668801 is about 7188.1013487568. The cubic root of 51668801 is about 372.4569888630.

The spelling of 51668801 in words is "fifty-one million, six hundred sixty-eight thousand, eight hundred one".