68645321567 has 2 divisors, whose sum is σ = 68645321568. Its totient is φ = 68645321566.

The previous prime is 68645321509. The next prime is 68645321609. The reversal of 68645321567 is 76512354686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68645321567 - 2¹⁰ = 68645320543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68645321267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34322660783 + 34322660784.

It is an arithmetic number, because the mean of its divisors is an integer number (34322660784).

Almost surely, 2^68645321567 is an apocalyptic number.

68645321567 is a deficient number, since it is larger than the sum of its proper divisors (1).

68645321567 is an equidigital number, since it uses as much as digits as its factorization.

68645321567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7257600, while the sum is 53.

The spelling of 68645321567 in words is "sixty-eight billion, six hundred forty-five million, three hundred twenty-one thousand, five hundred sixty-seven".