640783624067 has 8 divisors (see below), whose sum is σ = 641572552800. Its totient is φ = 639994910464.

The previous prime is 640783624051. The next prime is 640783624079. The reversal of 640783624067 is 760426387046.

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

It is a cyclic number.

It is not a de Polignac number, because 640783624067 - 2⁴ = 640783624051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640783624007) 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 7 ways as a sum of consecutive naturals, for example, 6376034 + ... + 6475752.

It is an arithmetic number, because the mean of its divisors is an integer number (80196569100).

Almost surely, 2^640783624067 is an apocalyptic number.

640783624067 is a deficient number, since it is larger than the sum of its proper divisors (788928733).

640783624067 is an equidigital number, since it uses as much as digits as its factorization.

640783624067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107565.

The product of its (nonzero) digits is 8128512, while the sum is 53.

The spelling of 640783624067 in words is "six hundred forty billion, seven hundred eighty-three million, six hundred twenty-four thousand, sixty-seven".