648863842957 has 4 divisors (see below), whose sum is σ = 707851465056. Its totient is φ = 589876220860.

The previous prime is 648863842909. The next prime is 648863842973. The reversal of 648863842957 is 759248368846.

It is a happy number.

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 648863842957 - 2³¹ = 646716359309 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 (648863842987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29493811033 + ... + 29493811054.

It is an arithmetic number, because the mean of its divisors is an integer number (176962866264).

Almost surely, 2^648863842957 is an apocalyptic number.

It is an amenable number.

648863842957 is a deficient number, since it is larger than the sum of its proper divisors (58987622099).

648863842957 is a wasteful number, since it uses less digits than its factorization.

648863842957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58987622098.

The product of its digits is 557383680, while the sum is 70.

The spelling of 648863842957 in words is "six hundred forty-eight billion, eight hundred sixty-three million, eight hundred forty-two thousand, nine hundred fifty-seven".