65637221851 has 2 divisors, whose sum is σ = 65637221852. Its totient is φ = 65637221850.

The previous prime is 65637221827. The next prime is 65637221857. The reversal of 65637221851 is 15812273656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65637221851 - 2²¹ = 65635124699 is a prime.

It is not a weakly prime, because it can be changed into another prime (65637221857) 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, 32818610925 + 32818610926.

It is an arithmetic number, because the mean of its divisors is an integer number (32818610926).

Almost surely, 2^65637221851 is an apocalyptic number.

65637221851 is a deficient number, since it is larger than the sum of its proper divisors (1).

65637221851 is an equidigital number, since it uses as much as digits as its factorization.

65637221851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

The spelling of 65637221851 in words is "sixty-five billion, six hundred thirty-seven million, two hundred twenty-one thousand, eight hundred fifty-one".