643423120634 has 16 divisors (see below), whose sum is σ = 1103261342400. Its totient is φ = 275690196384.

The previous prime is 643423120597. The next prime is 643423120663. The reversal of 643423120634 is 436021324346.

It is a super-3 number, since 3×643423120634³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5150204 + ... + 5273655.

It is an arithmetic number, because the mean of its divisors is an integer number (68953833900).

Almost surely, 2^643423120634 is an apocalyptic number.

643423120634 is a deficient number, since it is larger than the sum of its proper divisors (459838221766).

643423120634 is a wasteful number, since it uses less digits than its factorization.

643423120634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10428277.

The product of its (nonzero) digits is 248832, while the sum is 38.

The spelling of 643423120634 in words is "six hundred forty-three billion, four hundred twenty-three million, one hundred twenty thousand, six hundred thirty-four".