640435744601 has 4 divisors (see below), whose sum is σ = 640439861712. Its totient is φ = 640431627492.

The previous prime is 640435744567. The next prime is 640435744621. The reversal of 640435744601 is 106447534046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640435744601 - 2¹⁸ = 640435482457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640435744621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1815671 + ... + 2139516.

It is an arithmetic number, because the mean of its divisors is an integer number (160109965428).

Almost surely, 2^640435744601 is an apocalyptic number.

It is an amenable number.

640435744601 is a deficient number, since it is larger than the sum of its proper divisors (4117111).

640435744601 is a wasteful number, since it uses less digits than its factorization.

640435744601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117110.

The product of its (nonzero) digits is 967680, while the sum is 44.

The spelling of 640435744601 in words is "six hundred forty billion, four hundred thirty-five million, seven hundred forty-four thousand, six hundred one".