42098434561 has 4 divisors (see below), whose sum is σ = 42099452500. Its totient is φ = 42097416624.

The previous prime is 42098434529. The next prime is 42098434579. The reversal of 42098434561 is 16543489024.

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 8218510336 + 33879924225 = 90656^2 + 184065^2 .

It is a cyclic number.

It is not a de Polignac number, because 42098434561 - 2⁵ = 42098434529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42098438561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444186 + ... + 530563.

It is an arithmetic number, because the mean of its divisors is an integer number (10524863125).

Almost surely, 2^42098434561 is an apocalyptic number.

It is an amenable number.

42098434561 is a deficient number, since it is larger than the sum of its proper divisors (1017939).

42098434561 is an equidigital number, since it uses as much as digits as its factorization.

42098434561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017938.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 42098434561 in words is "forty-two billion, ninety-eight million, four hundred thirty-four thousand, five hundred sixty-one".