643604315061 has 64 divisors (see below), whose sum is σ = 968697999360. Its totient is φ = 378100800000.

The previous prime is 643604315059. The next prime is 643604315087. The reversal of 643604315061 is 160513406346.

It is not a de Polignac number, because 643604315061 - 2¹ = 643604315059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643604315021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16697311 + ... + 16735811.

It is an arithmetic number, because the mean of its divisors is an integer number (15135906240).

Almost surely, 2^643604315061 is an apocalyptic number.

It is an amenable number.

643604315061 is a deficient number, since it is larger than the sum of its proper divisors (325093684299).

643604315061 is a wasteful number, since it uses less digits than its factorization.

643604315061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38898.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 643604315061 in words is "six hundred forty-three billion, six hundred four million, three hundred fifteen thousand, sixty-one".