648737224857 has 24 divisors (see below), whose sum is σ = 969899079240. Its totient is φ = 417353287680.

The previous prime is 648737224829. The next prime is 648737224871. The reversal of 648737224857 is 758422737846.

648737224857 is a `hidden beast` number, since 6 + 4 + 87 + 3 + 72 + 2 + 485 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 68586895881 + 580150328976 = 261891^2 + 761676^2 .

It is not a de Polignac number, because 648737224857 - 2²² = 648733030553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648737224794 and 648737224803.

It is not an unprimeable number, because it can be changed into a prime (648737224897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182088 + ... + 1153529.

It is an arithmetic number, because the mean of its divisors is an integer number (40412461635).

Almost surely, 2^648737224857 is an apocalyptic number.

It is an amenable number.

648737224857 is a deficient number, since it is larger than the sum of its proper divisors (321161854383).

648737224857 is a wasteful number, since it uses less digits than its factorization.

648737224857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337513 (or 1337510 counting only the distinct ones).

The product of its digits is 126443520, while the sum is 63.

The spelling of 648737224857 in words is "six hundred forty-eight billion, seven hundred thirty-seven million, two hundred twenty-four thousand, eight hundred fifty-seven".