42640860673 has 4 divisors (see below), whose sum is σ = 43445405268. Its totient is φ = 41836316080.

The previous prime is 42640860659. The next prime is 42640860679. The reversal of 42640860673 is 37606804624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24027170049 + 18613690624 = 155007^2 + 136432^2 .

It is a cyclic number.

It is not a de Polignac number, because 42640860673 - 2²⁹ = 42103989761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42640860679) 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 3 ways as a sum of consecutive naturals, for example, 402272218 + ... + 402272323.

It is an arithmetic number, because the mean of its divisors is an integer number (10861351317).

Almost surely, 2^42640860673 is an apocalyptic number.

It is an amenable number.

42640860673 is a deficient number, since it is larger than the sum of its proper divisors (804544595).

42640860673 is an equidigital number, since it uses as much as digits as its factorization.

42640860673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804544594.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 42640860673 in words is "forty-two billion, six hundred forty million, eight hundred sixty thousand, six hundred seventy-three".