648671555 has 48 divisors (see below), whose sum is σ = 941402880. Its totient is φ = 427508928.

The previous prime is 648671519. The next prime is 648671563. The reversal of 648671555 is 555176846.

648671555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 648671555 - 2²⁶ = 581562691 is a prime.

It is a super-4 number, since 4×648671555⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 705386 + ... + 706304.

It is an arithmetic number, because the mean of its divisors is an integer number (19612560).

Almost surely, 2^648671555 is an apocalyptic number.

648671555 is a deficient number, since it is larger than the sum of its proper divisors (292731325).

648671555 is a wasteful number, since it uses less digits than its factorization.

648671555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 1041 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 47.

The square root of 648671555 is about 25469.0312929251. The cubic root of 648671555 is about 865.6485741341.

The spelling of 648671555 in words is "six hundred forty-eight million, six hundred seventy-one thousand, five hundred fifty-five".