643319695452 has 96 divisors (see below), whose sum is σ = 1762151652352. Its totient is φ = 178810799616.

The previous prime is 643319695427. The next prime is 643319695453. The reversal of 643319695452 is 254596913346.

It is a super-3 number, since 3×643319695452³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643319695392 and 643319695401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643319695453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29306793 + ... + 29328735.

Almost surely, 2^643319695452 is an apocalyptic number.

It is an amenable number.

643319695452 is an abundant number, since it is smaller than the sum of its proper divisors (1118831956900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643319695452 is a wasteful number, since it uses less digits than its factorization.

643319695452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31427 (or 31425 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 57.

The spelling of 643319695452 in words is "six hundred forty-three billion, three hundred nineteen million, six hundred ninety-five thousand, four hundred fifty-two".