64995851 has 2 divisors, whose sum is σ = 64995852. Its totient is φ = 64995850.

The previous prime is 64995817. The next prime is 64995857. The reversal of 64995851 is 15859946.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64995851 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64995796 and 64995805.

It is not a weakly prime, because it can be changed into another prime (64995857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32497925 + 32497926.

It is an arithmetic number, because the mean of its divisors is an integer number (32497926).

Almost surely, 2^64995851 is an apocalyptic number.

64995851 is a deficient number, since it is larger than the sum of its proper divisors (1).

64995851 is an equidigital number, since it uses as much as digits as its factorization.

64995851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 47.

The square root of 64995851 is about 8062.0004341354. Note that the first 3 decimals coincide. The cubic root of 64995851 is about 402.0640208096.

The spelling of 64995851 in words is "sixty-four million, nine hundred ninety-five thousand, eight hundred fifty-one".