64665215999 has 8 divisors (see below), whose sum is σ = 68071184880. Its totient is φ = 61259500800.

The previous prime is 64665215969. The next prime is 64665216043. The reversal of 64665215999 is 99951256646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64665215999 - 2¹² = 64665211903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64665215929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688529 + ... + 776789.

It is an arithmetic number, because the mean of its divisors is an integer number (8508898110).

Almost surely, 2^64665215999 is an apocalyptic number.

64665215999 is a deficient number, since it is larger than the sum of its proper divisors (3405968881).

64665215999 is a wasteful number, since it uses less digits than its factorization.

64665215999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126841.

The product of its digits is 31492800, while the sum is 62.

The spelling of 64665215999 in words is "sixty-four billion, six hundred sixty-five million, two hundred fifteen thousand, nine hundred ninety-nine".