64534215636391 has 2 divisors, whose sum is σ = 64534215636392. Its totient is φ = 64534215636390.

The previous prime is 64534215636389. The next prime is 64534215636439. The reversal of 64534215636391 is 19363651243546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64534215636391 - 2¹ = 64534215636389 is a prime.

It is a super-2 number, since 2×64534215636391² (a number of 28 digits) contains 22 as substring.

Together with 64534215636389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64534215636991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32267107818195 + 32267107818196.

It is an arithmetic number, because the mean of its divisors is an integer number (32267107818196).

Almost surely, 2^{64534215636391} is an apocalyptic number.

64534215636391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64534215636391 is an equidigital number, since it uses as much as digits as its factorization.

64534215636391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41990400, while the sum is 58.

The spelling of 64534215636391 in words is "sixty-four trillion, five hundred thirty-four billion, two hundred fifteen million, six hundred thirty-six thousand, three hundred ninety-one".