64517747855 has 16 divisors (see below), whose sum is σ = 86742291744. Its totient is φ = 45653834880.

The previous prime is 64517747809. The next prime is 64517747867. The reversal of 64517747855 is 55874771546.

It is not a de Polignac number, because 64517747855 - 2²² = 64513553551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64517747794 and 64517747803.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15849992 + ... + 15854061.

It is an arithmetic number, because the mean of its divisors is an integer number (5421393234).

Almost surely, 2^64517747855 is an apocalyptic number.

64517747855 is a deficient number, since it is larger than the sum of its proper divisors (22224543889).

64517747855 is a wasteful number, since it uses less digits than its factorization.

64517747855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31704106.

The product of its digits is 32928000, while the sum is 59.

The spelling of 64517747855 in words is "sixty-four billion, five hundred seventeen million, seven hundred forty-seven thousand, eight hundred fifty-five".