648522585481 has 3 divisors (see below), whose sum is σ = 648523390791. Its totient is φ = 648521780172.

The previous prime is 648522585463. The next prime is 648522585551. The reversal of 648522585481 is 184585225846.

The square root of 648522585481 is 805309.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8554585081 + 639968000400 = 92491^2 + 799980^2 .

It is not a de Polignac number, because 648522585481 - 2⁵ = 648522585449 is a prime.

It is a super-2 number, since 2×648522585481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648522585401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 402655 + ... + 1207963.

It is an arithmetic number, because the mean of its divisors is an integer number (216174463597).

Almost surely, 2^648522585481 is an apocalyptic number.

648522585481 is the 805309-th square number.

648522585481 is the 402655-th centered octagonal number.

It is an amenable number.

648522585481 is a deficient number, since it is larger than the sum of its proper divisors (805310).

648522585481 is an frugal number, since it uses more digits than its factorization.

648522585481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610618 (or 805309 counting only the distinct ones).

The product of its digits is 24576000, while the sum is 58.

The spelling of 648522585481 in words is "six hundred forty-eight billion, five hundred twenty-two million, five hundred eighty-five thousand, four hundred eighty-one".