64815944025667 has 2 divisors, whose sum is σ = 64815944025668. Its totient is φ = 64815944025666.

The previous prime is 64815944025653. The next prime is 64815944025713. The reversal of 64815944025667 is 76652044951846.

64815944025667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64815944025667 is a prime.

It is a super-2 number, since 2×64815944025667² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64815944025607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32407972012833 + 32407972012834.

It is an arithmetic number, because the mean of its divisors is an integer number (32407972012834).

Almost surely, 2^{64815944025667} is an apocalyptic number.

64815944025667 is a deficient number, since it is larger than the sum of its proper divisors (1).

64815944025667 is an equidigital number, since it uses as much as digits as its factorization.

64815944025667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 348364800, while the sum is 67.

The spelling of 64815944025667 in words is "sixty-four trillion, eight hundred fifteen billion, nine hundred forty-four million, twenty-five thousand, six hundred sixty-seven".