648988921065 has 16 divisors (see below), whose sum is σ = 1093033972800. Its totient is φ = 327910191552.

The previous prime is 648988921043. The next prime is 648988921073. The reversal of 648988921065 is 560129889846.

It is not a de Polignac number, because 648988921065 - 2¹¹ = 648988919017 is a prime.

It is a super-2 number, since 2×648988921065² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 648988920987 and 648988921005.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1138576770 + ... + 1138577339.

It is an arithmetic number, because the mean of its divisors is an integer number (68314623300).

Almost surely, 2^648988921065 is an apocalyptic number.

It is an amenable number.

648988921065 is a deficient number, since it is larger than the sum of its proper divisors (444045051735).

648988921065 is a wasteful number, since it uses less digits than its factorization.

648988921065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277154136.

The product of its (nonzero) digits is 59719680, while the sum is 66.

The spelling of 648988921065 in words is "six hundred forty-eight billion, nine hundred eighty-eight million, nine hundred twenty-one thousand, sixty-five".