16263728832181 has 8 divisors (see below), whose sum is σ = 16284551165784. Its totient is φ = 16242919376640.

The previous prime is 16263728832179. The next prime is 16263728832187. The reversal of 16263728832181 is 18123882736261.

It can be written as a sum of positive squares in 4 ways, for example, as 14140675847281 + 2123052984900 = 3760409^2 + 1457070^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16263728832181 - 2¹ = 16263728832179 is a prime.

It is a super-2 number, since 2×16263728832181² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16263728832187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690826 + ... + 5744971.

It is an arithmetic number, because the mean of its divisors is an integer number (2035568895723).

Almost surely, 2^{16263728832181} is an apocalyptic number.

It is an amenable number.

16263728832181 is a deficient number, since it is larger than the sum of its proper divisors (20822333603).

16263728832181 is a wasteful number, since it uses less digits than its factorization.

16263728832181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6439031.

The product of its digits is 9289728, while the sum is 58.

The spelling of 16263728832181 in words is "sixteen trillion, two hundred sixty-three billion, seven hundred twenty-eight million, eight hundred thirty-two thousand, one hundred eighty-one".