648557646433 has 8 divisors (see below), whose sum is σ = 657579291656. Its totient is φ = 639539712000.

The previous prime is 648557646329. The next prime is 648557646509. The reversal of 648557646433 is 334646755846.

It can be written as a sum of positive squares in 4 ways, for example, as 257040888064 + 391516758369 = 506992^2 + 625713^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648557646433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648557640433) 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, 574788 + ... + 1275733.

It is an arithmetic number, because the mean of its divisors is an integer number (82197411457).

Almost surely, 2^648557646433 is an apocalyptic number.

It is an amenable number.

648557646433 is a deficient number, since it is larger than the sum of its proper divisors (9021645223).

648557646433 is a wasteful number, since it uses less digits than its factorization.

648557646433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855395.

The product of its digits is 174182400, while the sum is 61.

The spelling of 648557646433 in words is "six hundred forty-eight billion, five hundred fifty-seven million, six hundred forty-six thousand, four hundred thirty-three".