64815338661 has 8 divisors (see below), whose sum is σ = 86635965504. Its totient is φ = 43102468800.

The previous prime is 64815338659. The next prime is 64815338663. The reversal of 64815338661 is 16683351846.

It is an interprime number because it is at equal distance from previous prime (64815338659) and next prime (64815338663).

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

It is not a de Polignac number, because 64815338661 - 2¹ = 64815338659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64815338663) 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 7 ways as a sum of consecutive naturals, for example, 26937841 + ... + 26940246.

It is an arithmetic number, because the mean of its divisors is an integer number (10829495688).

Almost surely, 2^64815338661 is an apocalyptic number.

It is an amenable number.

64815338661 is a deficient number, since it is larger than the sum of its proper divisors (21820626843).

64815338661 is a wasteful number, since it uses less digits than its factorization.

64815338661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53878491.

The product of its digits is 2488320, while the sum is 51.

The spelling of 64815338661 in words is "sixty-four billion, eight hundred fifteen million, three hundred thirty-eight thousand, six hundred sixty-one".