648981837533 has 4 divisors (see below), whose sum is σ = 648983550300. Its totient is φ = 648980124768.

The previous prime is 648981837521. The next prime is 648981837577. The reversal of 648981837533 is 335738189846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 285298061689 + 363683775844 = 534133^2 + 603062^2 .

It is a cyclic number.

It is not a de Polignac number, because 648981837533 - 2⁸ = 648981837277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648981837533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648981837503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7610 + ... + 1139307.

It is an arithmetic number, because the mean of its divisors is an integer number (162245887575).

Almost surely, 2^648981837533 is an apocalyptic number.

It is an amenable number.

648981837533 is a deficient number, since it is larger than the sum of its proper divisors (1712767).

648981837533 is a wasteful number, since it uses less digits than its factorization.

648981837533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712766.

The product of its digits is 104509440, while the sum is 65.

The spelling of 648981837533 in words is "six hundred forty-eight billion, nine hundred eighty-one million, eight hundred thirty-seven thousand, five hundred thirty-three".