42173218371649 has 8 divisors (see below), whose sum is σ = 42547951673640. Its totient is φ = 41798511718656.

The previous prime is 42173218371601. The next prime is 42173218371727. The reversal of 42173218371649 is 94617381237124.

42173218371649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 187807823424 + 41985410548225 = 433368^2 + 6479615^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42173218371649 - 2¹³ = 42173218363457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42173218371593 and 42173218371602.

It is not an unprimeable number, because it can be changed into a prime (42173215371649) 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 7 ways as a sum of consecutive naturals, for example, 3476362 + ... + 9819955.

It is an arithmetic number, because the mean of its divisors is an integer number (5318493959205).

Almost surely, 2^{42173218371649} is an apocalyptic number.

It is an amenable number.

42173218371649 is a deficient number, since it is larger than the sum of its proper divisors (374733301991).

42173218371649 is a wasteful number, since it uses less digits than its factorization.

42173218371649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13324499.

The product of its digits is 12192768, while the sum is 58.

The spelling of 42173218371649 in words is "forty-two trillion, one hundred seventy-three billion, two hundred eighteen million, three hundred seventy-one thousand, six hundred forty-nine".