42604638521 has 4 divisors (see below), whose sum is σ = 43595444112. Its totient is φ = 41613832932.

The previous prime is 42604638511. The next prime is 42604638533. The reversal of 42604638521 is 12583640624.

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 42604638521 - 2¹⁰ = 42604637497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42604638511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495402731 + ... + 495402816.

It is an arithmetic number, because the mean of its divisors is an integer number (10898861028).

Almost surely, 2^42604638521 is an apocalyptic number.

It is an amenable number.

42604638521 is a deficient number, since it is larger than the sum of its proper divisors (990805591).

42604638521 is an equidigital number, since it uses as much as digits as its factorization.

42604638521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990805590.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 42604638521 in words is "forty-two billion, six hundred four million, six hundred thirty-eight thousand, five hundred twenty-one".