64866678869 has 2 divisors, whose sum is σ = 64866678870. Its totient is φ = 64866678868.

The previous prime is 64866678827. The next prime is 64866678913. The reversal of 64866678869 is 96887666846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61858156369 + 3008522500 = 248713^2 + 54850^2 .

It is a cyclic number.

It is not a de Polignac number, because 64866678869 - 2¹² = 64866674773 is a prime.

It is a super-2 number, since 2×64866678869² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64866678796 and 64866678805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64866678769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32433339434 + 32433339435.

It is an arithmetic number, because the mean of its divisors is an integer number (32433339435).

Almost surely, 2^64866678869 is an apocalyptic number.

It is an amenable number.

64866678869 is a deficient number, since it is larger than the sum of its proper divisors (1).

64866678869 is an equidigital number, since it uses as much as digits as its factorization.

64866678869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1003290624, while the sum is 74.

The spelling of 64866678869 in words is "sixty-four billion, eight hundred sixty-six million, six hundred seventy-eight thousand, eight hundred sixty-nine".