16531925817650 has 12 divisors (see below), whose sum is σ = 30749382020922. Its totient is φ = 6612770327040.

The previous prime is 16531925817623. The next prime is 16531925817653. The reversal of 16531925817650 is 5671852913561.

It can be written as a sum of positive squares in 3 ways, for example, as 15060243847009 + 1471681970641 = 3880753^2 + 1213129^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16531925817650.

It is not an unprimeable number, because it can be changed into a prime (16531925817653) 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 5 ways as a sum of consecutive naturals, for example, 165319258127 + ... + 165319258226.

Almost surely, 2^{16531925817650} is an apocalyptic number.

16531925817650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16531925817650 is a deficient number, since it is larger than the sum of its proper divisors (14217456203272).

16531925817650 is a wasteful number, since it uses less digits than its factorization.

16531925817650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330638516365 (or 330638516360 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 59.

The spelling of 16531925817650 in words is "sixteen trillion, five hundred thirty-one billion, nine hundred twenty-five million, eight hundred seventeen thousand, six hundred fifty".