42611994809 has 4 divisors (see below), whose sum is σ = 42621165300. Its totient is φ = 42602824320.

The previous prime is 42611994779. The next prime is 42611994833. The reversal of 42611994809 is 90849911624.

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 22354735225 + 20257259584 = 149515^2 + 142328^2 .

It is a cyclic number.

It is not a de Polignac number, because 42611994809 - 2⁸ = 42611994553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42611994889) 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, 4578272 + ... + 4587569.

It is an arithmetic number, because the mean of its divisors is an integer number (10655291325).

Almost surely, 2^42611994809 is an apocalyptic number.

It is an amenable number.

42611994809 is a deficient number, since it is larger than the sum of its proper divisors (9170491).

42611994809 is an equidigital number, since it uses as much as digits as its factorization.

42611994809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9170490.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 42611994809 in words is "forty-two billion, six hundred eleven million, nine hundred ninety-four thousand, eight hundred nine".