64633605251 has 2 divisors, whose sum is σ = 64633605252. Its totient is φ = 64633605250.

The previous prime is 64633605241. The next prime is 64633605259. The reversal of 64633605251 is 15250633646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64633605251 - 2¹⁴ = 64633588867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64633605199 and 64633605208.

It is not a weakly prime, because it can be changed into another prime (64633605259) by changing a digit.

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 as a sum of consecutive naturals, namely, 32316802625 + 32316802626.

It is an arithmetic number, because the mean of its divisors is an integer number (32316802626).

Almost surely, 2^64633605251 is an apocalyptic number.

64633605251 is a deficient number, since it is larger than the sum of its proper divisors (1).

64633605251 is an equidigital number, since it uses as much as digits as its factorization.

64633605251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 64633605251 in words is "sixty-four billion, six hundred thirty-three million, six hundred five thousand, two hundred fifty-one".