64415516566 has 4 divisors (see below), whose sum is σ = 96623274852. Its totient is φ = 32207758282.

The previous prime is 64415516549. The next prime is 64415516569. The reversal of 64415516566 is 66561551446.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64415516569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16103879140 + ... + 16103879143.

It is an arithmetic number, because the mean of its divisors is an integer number (24155818713).

Almost surely, 2^64415516566 is an apocalyptic number.

64415516566 is a deficient number, since it is larger than the sum of its proper divisors (32207758286).

64415516566 is a wasteful number, since it uses less digits than its factorization.

64415516566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32207758285.

The product of its digits is 2592000, while the sum is 49.

The spelling of 64415516566 in words is "sixty-four billion, four hundred fifteen million, five hundred sixteen thousand, five hundred sixty-six".