648127555 has 4 divisors (see below), whose sum is σ = 777753072. Its totient is φ = 518502040.

The previous prime is 648127553. The next prime is 648127577. The reversal of 648127555 is 555721846.

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

It is not a de Polignac number, because 648127555 - 2¹ = 648127553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648127553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64812751 + ... + 64812760.

It is an arithmetic number, because the mean of its divisors is an integer number (194438268).

Almost surely, 2^648127555 is an apocalyptic number.

648127555 is a deficient number, since it is larger than the sum of its proper divisors (129625517).

648127555 is a wasteful number, since it uses less digits than its factorization.

648127555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129625516.

The product of its digits is 336000, while the sum is 43.

The square root of 648127555 is about 25458.3494162524. The cubic root of 648127555 is about 865.4065181333.

The spelling of 648127555 in words is "six hundred forty-eight million, one hundred twenty-seven thousand, five hundred fifty-five".