643745350635 has 8 divisors (see below), whose sum is σ = 1029992561040. Its totient is φ = 343330853664.

The previous prime is 643745350613. The next prime is 643745350637. The reversal of 643745350635 is 536053547346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643745350635 - 2⁸ = 643745350379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643745350637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21458178340 + ... + 21458178369.

It is an arithmetic number, because the mean of its divisors is an integer number (128749070130).

Almost surely, 2^643745350635 is an apocalyptic number.

643745350635 is a deficient number, since it is larger than the sum of its proper divisors (386247210405).

643745350635 is a wasteful number, since it uses less digits than its factorization.

643745350635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42916356717.

The product of its (nonzero) digits is 13608000, while the sum is 51.

The spelling of 643745350635 in words is "six hundred forty-three billion, seven hundred forty-five million, three hundred fifty thousand, six hundred thirty-five".