24642198109 has 4 divisors (see below), whose sum is σ = 24643455516. Its totient is φ = 24640940704.

The previous prime is 24642198103. The next prime is 24642198149. The reversal of 24642198109 is 90189124642.

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 538704100 + 24103494009 = 23210^2 + 155253^2 .

It is a cyclic number.

It is not a de Polignac number, because 24642198109 - 2²¹ = 24640100957 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 (24642198103) 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, 598834 + ... + 638659.

It is an arithmetic number, because the mean of its divisors is an integer number (6160863879).

Almost surely, 2^24642198109 is an apocalyptic number.

It is an amenable number.

24642198109 is a deficient number, since it is larger than the sum of its proper divisors (1257407).

24642198109 is a wasteful number, since it uses less digits than its factorization.

24642198109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257406.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 24642198109 in words is "twenty-four billion, six hundred forty-two million, one hundred ninety-eight thousand, one hundred nine".