42888721613 has 4 divisors (see below), whose sum is σ = 42889277820. Its totient is φ = 42888165408.

The previous prime is 42888721597. The next prime is 42888721627. The reversal of 42888721613 is 31612788824.

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 17161524004 + 25727197609 = 131002^2 + 160397^2 .

It is a cyclic number.

It is not a de Polignac number, because 42888721613 - 2⁴ = 42888721597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42888721313) 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, 139370 + ... + 324347.

It is an arithmetic number, because the mean of its divisors is an integer number (10722319455).

Almost surely, 2^42888721613 is an apocalyptic number.

It is an amenable number.

42888721613 is a deficient number, since it is larger than the sum of its proper divisors (556207).

42888721613 is an equidigital number, since it uses as much as digits as its factorization.

42888721613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556206.

The product of its digits is 1032192, while the sum is 50.

The spelling of 42888721613 in words is "forty-two billion, eight hundred eighty-eight million, seven hundred twenty-one thousand, six hundred thirteen".