64111687697 has 2 divisors, whose sum is σ = 64111687698. Its totient is φ = 64111687696.

The previous prime is 64111687693. The next prime is 64111687763. The reversal of 64111687697 is 79678611146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62178414736 + 1933272961 = 249356^2 + 43969^2 .

It is a cyclic number.

It is not a de Polignac number, because 64111687697 - 2² = 64111687693 is a prime.

It is a super-2 number, since 2×64111687697² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64111687693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32055843848 + 32055843849.

It is an arithmetic number, because the mean of its divisors is an integer number (32055843849).

Almost surely, 2^64111687697 is an apocalyptic number.

It is an amenable number.

64111687697 is a deficient number, since it is larger than the sum of its proper divisors (1).

64111687697 is an equidigital number, since it uses as much as digits as its factorization.

64111687697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 56.

The spelling of 64111687697 in words is "sixty-four billion, one hundred eleven million, six hundred eighty-seven thousand, six hundred ninety-seven".