16187121727 has 48 divisors (see below), whose sum is σ = 21084053760. Its totient is φ = 12328243200.

The previous prime is 16187121703. The next prime is 16187121733. The reversal of 16187121727 is 72712178161.

It is a de Polignac number, because none of the positive numbers 2^k-16187121727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16187121127) 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 47 ways as a sum of consecutive naturals, for example, 1051099 + ... + 1066387.

It is an arithmetic number, because the mean of its divisors is an integer number (439251120).

Almost surely, 2^16187121727 is an apocalyptic number.

16187121727 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

16187121727 is a deficient number, since it is larger than the sum of its proper divisors (4896932033).

16187121727 is a wasteful number, since it uses less digits than its factorization.

16187121727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15392 (or 15385 counting only the distinct ones).

The product of its digits is 65856, while the sum is 43.

Adding to 16187121727 its reverse (72712178161), we get a palindrome (88899299888).

The spelling of 16187121727 in words is "sixteen billion, one hundred eighty-seven million, one hundred twenty-one thousand, seven hundred twenty-seven".