51966643 has 2 divisors, whose sum is σ = 51966644. Its totient is φ = 51966642.

The previous prime is 51966599. The next prime is 51966701. The reversal of 51966643 is 34666915.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51966643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51966596 and 51966605.

It is not a weakly prime, because it can be changed into another prime (51966043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25983321 + 25983322.

It is an arithmetic number, because the mean of its divisors is an integer number (25983322).

Almost surely, 2^51966643 is an apocalyptic number.

51966643 is a deficient number, since it is larger than the sum of its proper divisors (1).

51966643 is an equidigital number, since it uses as much as digits as its factorization.

51966643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 40.

The square root of 51966643 is about 7208.7892880844. The cubic root of 51966643 is about 373.1712874723.

The spelling of 51966643 in words is "fifty-one million, nine hundred sixty-six thousand, six hundred forty-three".