648336047965 has 4 divisors (see below), whose sum is σ = 778003257564. Its totient is φ = 518668838368.

The previous prime is 648336047941. The next prime is 648336047969. The reversal of 648336047965 is 569740633846.

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 340601799321 + 307734248644 = 583611^2 + 554738^2 .

It is a cyclic number.

It is not a de Polignac number, because 648336047965 - 2³¹ = 646188564317 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 (648336047969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64833604792 + ... + 64833604801.

It is an arithmetic number, because the mean of its divisors is an integer number (194500814391).

Almost surely, 2^648336047965 is an apocalyptic number.

It is an amenable number.

648336047965 is a deficient number, since it is larger than the sum of its proper divisors (129667209599).

648336047965 is a wasteful number, since it uses less digits than its factorization.

648336047965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129667209598.

The product of its (nonzero) digits is 78382080, while the sum is 61.

The spelling of 648336047965 in words is "six hundred forty-eight billion, three hundred thirty-six million, forty-seven thousand, nine hundred sixty-five".