64866666331 has 2 divisors, whose sum is σ = 64866666332. Its totient is φ = 64866666330.

The previous prime is 64866666287. The next prime is 64866666341. The reversal of 64866666331 is 13366666846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64866666331 - 2¹³ = 64866658139 is a prime.

It is a super-2 number, since 2×64866666331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64866666341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32433333165 + 32433333166.

It is an arithmetic number, because the mean of its divisors is an integer number (32433333166).

Almost surely, 2^64866666331 is an apocalyptic number.

64866666331 is a deficient number, since it is larger than the sum of its proper divisors (1).

64866666331 is an equidigital number, since it uses as much as digits as its factorization.

64866666331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13436928, while the sum is 55.

The spelling of 64866666331 in words is "sixty-four billion, eight hundred sixty-six million, six hundred sixty-six thousand, three hundred thirty-one".