648755557 has 8 divisors (see below), whose sum is σ = 663600632. Its totient is φ = 634046400.

The previous prime is 648755533. The next prime is 648755567. The reversal of 648755557 is 755557846.

It can be written as a sum of positive squares in 4 ways, for example, as 1256641 + 647498916 = 1121^2 + 25446^2 .

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 648755557 - 2²³ = 640366949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648755567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24294 + ... + 43447.

It is an arithmetic number, because the mean of its divisors is an integer number (82950079).

Almost surely, 2^648755557 is an apocalyptic number.

It is an amenable number.

648755557 is a deficient number, since it is larger than the sum of its proper divisors (14845075).

648755557 is a wasteful number, since it uses less digits than its factorization.

648755557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67959.

The product of its digits is 5880000, while the sum is 52.

The square root of 648755557 is about 25470.6803403443. The cubic root of 648755557 is about 865.6859392549.

The spelling of 648755557 in words is "six hundred forty-eight million, seven hundred fifty-five thousand, five hundred fifty-seven".