643514508682 has 4 divisors (see below), whose sum is σ = 965271763026. Its totient is φ = 321757254340.

The previous prime is 643514508671. The next prime is 643514508697. The reversal of 643514508682 is 286805415346.

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

It can be written as a sum of positive squares in only one way, i.e., 578860767241 + 64653741441 = 760829^2 + 254271^2 .

It is a super-2 number, since 2×643514508682² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160878627169 + ... + 160878627172.

Almost surely, 2^643514508682 is an apocalyptic number.

643514508682 is a deficient number, since it is larger than the sum of its proper divisors (321757254344).

643514508682 is a wasteful number, since it uses less digits than its factorization.

643514508682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321757254343.

The product of its (nonzero) digits is 5529600, while the sum is 52.

The spelling of 643514508682 in words is "six hundred forty-three billion, five hundred fourteen million, five hundred eight thousand, six hundred eighty-two".