42173683181785 has 8 divisors (see below), whose sum is σ = 50888024348616. Its totient is φ = 33552543525120.

The previous prime is 42173683181753. The next prime is 42173683181801. The reversal of 42173683181785 is 58718138637124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2068960038544 + 40104723143241 = 1438388^2 + 6332829^2 .

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

It is not a de Polignac number, because 42173683181785 - 2⁵ = 42173683181753 is a prime.

It is a super-2 number, since 2×42173683181785² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23300376544 + ... + 23300378353.

It is an arithmetic number, because the mean of its divisors is an integer number (6361003043577).

Almost surely, 2^{42173683181785} is an apocalyptic number.

It is an amenable number.

42173683181785 is a deficient number, since it is larger than the sum of its proper divisors (8714341166831).

42173683181785 is a wasteful number, since it uses less digits than its factorization.

42173683181785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46600755083.

The product of its digits is 54190080, while the sum is 64.

The spelling of 42173683181785 in words is "forty-two trillion, one hundred seventy-three billion, six hundred eighty-three million, one hundred eighty-one thousand, seven hundred eighty-five".