648686855 has 8 divisors (see below), whose sum is σ = 782924832. Its totient is φ = 515949088.

The previous prime is 648686827. The next prime is 648686891. The reversal of 648686855 is 558686846.

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 648686855 - 2¹⁶ = 648621319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648686855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374099 + ... + 375828.

It is an arithmetic number, because the mean of its divisors is an integer number (97865604).

Almost surely, 2^648686855 is an apocalyptic number.

648686855 is a deficient number, since it is larger than the sum of its proper divisors (134237977).

648686855 is a wasteful number, since it uses less digits than its factorization.

648686855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750105.

The product of its digits is 11059200, while the sum is 56.

The square root of 648686855 is about 25469.3316559348. The cubic root of 648686855 is about 865.6553800022.

Subtracting from 648686855 its reverse (558686846), we obtain a palindrome (90000009).

The spelling of 648686855 in words is "six hundred forty-eight million, six hundred eighty-six thousand, eight hundred fifty-five".