643244013235 has 16 divisors (see below), whose sum is σ = 827849302560. Its totient is φ = 478312922880.

The previous prime is 643244013101. The next prime is 643244013239. The reversal of 643244013235 is 532310442346.

643244013235 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643244013235 - 2¹⁷ = 643243882163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643244013194 and 643244013203.

It is not an unprimeable number, because it can be changed into a prime (643244013239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63872226 + ... + 63882295.

It is an arithmetic number, because the mean of its divisors is an integer number (51740581410).

Almost surely, 2^643244013235 is an apocalyptic number.

643244013235 is a deficient number, since it is larger than the sum of its proper divisors (184605289325).

643244013235 is a wasteful number, since it uses less digits than its factorization.

643244013235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127754598.

The product of its (nonzero) digits is 207360, while the sum is 37.

The spelling of 643244013235 in words is "six hundred forty-three billion, two hundred forty-four million, thirteen thousand, two hundred thirty-five".