42163613721 has 10 divisors (see below), whose sum is σ = 62985151482. Its totient is φ = 28109075760.

The previous prime is 42163613669. The next prime is 42163613747. The reversal of 42163613721 is 12731636124.

42163613721 is a `hidden beast` number, since 4 + 2 + 1 + 636 + 13 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 32400000000 + 9763613721 = 180000^2 + 98811^2 .

It is not a de Polignac number, because 42163613721 - 2¹⁹ = 42163089433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42163613221) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 260269140 + ... + 260269301.

Almost surely, 2^42163613721 is an apocalyptic number.

It is an amenable number.

42163613721 is a deficient number, since it is larger than the sum of its proper divisors (20821537761).

42163613721 is an equidigital number, since it uses as much as digits as its factorization.

42163613721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520538453 (or 520538444 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The spelling of 42163613721 in words is "forty-two billion, one hundred sixty-three million, six hundred thirteen thousand, seven hundred twenty-one".