42123638871999 has 16 divisors (see below), whose sum is σ = 62405523248640. Its totient is φ = 28082366367480.

The previous prime is 42123638871917. The next prime is 42123638872087. The reversal of 42123638871999 is 99917883632124.

42123638871999 is a `hidden beast` number, since 4 + 2 + 1 + 236 + 388 + 7 + 1 + 9 + 9 + 9 = 666.

It is not a de Polignac number, because 42123638871999 - 2¹⁵ = 42123638839231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42123638872999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14012964 + ... + 16751430.

It is an arithmetic number, because the mean of its divisors is an integer number (3900345203040).

Almost surely, 2^{42123638871999} is an apocalyptic number.

42123638871999 is a deficient number, since it is larger than the sum of its proper divisors (20281884376641).

42123638871999 is a wasteful number, since it uses less digits than its factorization.

42123638871999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308187 (or 3308181 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 72.

The spelling of 42123638871999 in words is "forty-two trillion, one hundred twenty-three billion, six hundred thirty-eight million, eight hundred seventy-one thousand, nine hundred ninety-nine".