201728215126369 has 4 divisors (see below), whose sum is σ = 201728251217920. Its totient is φ = 201728179034820.

The previous prime is 201728215126367. The next prime is 201728215126379. The reversal of 201728215126369 is 963621512827102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201728215126369 - 2¹ = 201728215126367 is a prime.

It is a super-2 number, since 2×201728215126369² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201728215126363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7675137 + ... + 21502654.

It is an arithmetic number, because the mean of its divisors is an integer number (50432062804480).

Almost surely, 2^{201728215126369} is an apocalyptic number.

It is an amenable number.

201728215126369 is a deficient number, since it is larger than the sum of its proper divisors (36091551).

201728215126369 is an equidigital number, since it uses as much as digits as its factorization.

201728215126369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36091550.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 201728215126369 in words is "two hundred one trillion, seven hundred twenty-eight billion, two hundred fifteen million, one hundred twenty-six thousand, three hundred sixty-nine".