648588147965 has 4 divisors (see below), whose sum is σ = 778305777564. Its totient is φ = 518870518368.

The previous prime is 648588147941. The next prime is 648588147971. The reversal of 648588147965 is 569741885846.

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 235382166244 + 413205981721 = 485162^2 + 642811^2 .

It is a cyclic number.

It is not a de Polignac number, because 648588147965 - 2⁶ = 648588147901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64858814792 + ... + 64858814801.

It is an arithmetic number, because the mean of its divisors is an integer number (194576444391).

Almost surely, 2^648588147965 is an apocalyptic number.

It is an amenable number.

648588147965 is a deficient number, since it is larger than the sum of its proper divisors (129717629599).

648588147965 is a wasteful number, since it uses less digits than its factorization.

648588147965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129717629598.

The product of its digits is 464486400, while the sum is 71.

The spelling of 648588147965 in words is "six hundred forty-eight billion, five hundred eighty-eight million, one hundred forty-seven thousand, nine hundred sixty-five".