17845642872 has 64 divisors (see below), whose sum is σ = 49845213600. Its totient is φ = 5915669760.

The previous prime is 17845642777. The next prime is 17845642877. The reversal of 17845642872 is 27824654871.

17845642872 is a `hidden beast` number, since 1 + 7 + 8 + 4 + 564 + 2 + 8 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17845642877) 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 15 ways as a sum of consecutive naturals, for example, 189133 + ... + 267324.

Almost surely, 2^17845642872 is an apocalyptic number.

17845642872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

17845642872 is an abundant number, since it is smaller than the sum of its proper divisors (31999570728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17845642872 is a wasteful number, since it uses less digits than its factorization.

17845642872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456653 (or 456643 counting only the distinct ones).

The product of its digits is 6021120, while the sum is 54.

The spelling of 17845642872 in words is "seventeen billion, eight hundred forty-five million, six hundred forty-two thousand, eight hundred seventy-two".