646314699969 has 27 divisors (see below), whose sum is σ = 944486718019. Its totient is φ = 425893665120.

The previous prime is 646314699941. The next prime is 646314700033. The reversal of 646314699969 is 969996413646.

The square root of 646314699969 is 803937.

It is a perfect power (a square), and thus also a powerful number.

646314699969 is a `hidden beast` number, since 6 + 46 + 31 + 469 + 9 + 96 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 124106130369 + 522208569600 = 352287^2 + 722640^2 .

It is not a de Polignac number, because 646314699969 - 2¹⁹ = 646314175681 is a prime.

It is a super-2 number, since 2×646314699969² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646314699897 and 646314699906.

It is not an unprimeable number, because it can be changed into a prime (646314691969) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 214649674 + ... + 214652684.

Almost surely, 2^646314699969 is an apocalyptic number.

646314699969 is the 803937-th square number.

646314699969 is the 401969-th centered octagonal number.

It is an amenable number.

646314699969 is a deficient number, since it is larger than the sum of its proper divisors (298172018050).

646314699969 is an frugal number, since it uses more digits than its factorization.

646314699969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6206 (or 3103 counting only the distinct ones).

The product of its digits is 408146688, while the sum is 72.

The spelling of 646314699969 in words is "six hundred forty-six billion, three hundred fourteen million, six hundred ninety-nine thousand, nine hundred sixty-nine".