648415555 has 4 divisors (see below), whose sum is σ = 778098672. Its totient is φ = 518732440.

The previous prime is 648415549. The next prime is 648415567. The reversal of 648415555 is 555514846.

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

It is not a de Polignac number, because 648415555 - 2⁹ = 648415043 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64841551 + ... + 64841560.

It is an arithmetic number, because the mean of its divisors is an integer number (194524668).

Almost surely, 2^648415555 is an apocalyptic number.

648415555 is a deficient number, since it is larger than the sum of its proper divisors (129683117).

648415555 is a wasteful number, since it uses less digits than its factorization.

648415555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129683116.

The product of its digits is 480000, while the sum is 43.

The square root of 648415555 is about 25464.0050856106. The cubic root of 648415555 is about 865.5346822926.

The spelling of 648415555 in words is "six hundred forty-eight million, four hundred fifteen thousand, five hundred fifty-five".