64866669331 has 4 divisors (see below), whose sum is σ = 65780284464. Its totient is φ = 63953054200.

The previous prime is 64866669319. The next prime is 64866669353. The reversal of 64866669331 is 13396666846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13396666846 = 2 ⋅6698333423.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64866669331 is a prime.

It is a super-2 number, since 2×64866669331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64866666331) 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 in 3 ways as a sum of consecutive naturals, for example, 456807460 + ... + 456807601.

It is an arithmetic number, because the mean of its divisors is an integer number (16445071116).

Almost surely, 2^64866669331 is an apocalyptic number.

64866669331 is a deficient number, since it is larger than the sum of its proper divisors (913615133).

64866669331 is an equidigital number, since it uses as much as digits as its factorization.

64866669331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913615132.

The product of its digits is 20155392, while the sum is 58.

The spelling of 64866669331 in words is "sixty-four billion, eight hundred sixty-six million, six hundred sixty-nine thousand, three hundred thirty-one".