64216865503550 has 24 divisors (see below), whose sum is σ = 119480919132792. Its totient is φ = 25678671084000.

The previous prime is 64216865503517. The next prime is 64216865503649. The reversal of 64216865503550 is 5530556861246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201717296 + ... + 202035395.

It is an arithmetic number, because the mean of its divisors is an integer number (4978371630533).

Almost surely, 2^{64216865503550} is an apocalyptic number.

64216865503550 is a deficient number, since it is larger than the sum of its proper divisors (55264053629242).

64216865503550 is a wasteful number, since it uses less digits than its factorization.

64216865503550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403755884 (or 403755879 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 56.

The spelling of 64216865503550 in words is "sixty-four trillion, two hundred sixteen billion, eight hundred sixty-five million, five hundred three thousand, five hundred fifty".