648117637 has 4 divisors (see below), whose sum is σ = 649126240. Its totient is φ = 647109036.

The previous prime is 648117593. The next prime is 648117643. The reversal of 648117637 is 736711846.

648117637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648117637 - 2²³ = 639729029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648117593 and 648117602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648117737) 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, 503337 + ... + 504622.

It is an arithmetic number, because the mean of its divisors is an integer number (162281560).

Almost surely, 2^648117637 is an apocalyptic number.

It is an amenable number.

648117637 is a deficient number, since it is larger than the sum of its proper divisors (1008603).

648117637 is a wasteful number, since it uses less digits than its factorization.

648117637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008602.

The product of its digits is 169344, while the sum is 43.

The square root of 648117637 is about 25458.1546267596. The cubic root of 648117637 is about 865.4021038039.

The spelling of 648117637 in words is "six hundred forty-eight million, one hundred seventeen thousand, six hundred thirty-seven".