16575736121 has 6 divisors (see below), whose sum is σ = 19281978810. Its totient is φ = 14207773776.

The previous prime is 16575736091. The next prime is 16575736141. The reversal of 16575736121 is 12163757561.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12468848896 + 4106887225 = 111664^2 + 64085^2 .

It is not a de Polignac number, because 16575736121 - 2²² = 16571541817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16575736141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 169140116 + ... + 169140213.

It is an arithmetic number, because the mean of its divisors is an integer number (3213663135).

Almost surely, 2^16575736121 is an apocalyptic number.

It is an amenable number.

16575736121 is a deficient number, since it is larger than the sum of its proper divisors (2706242689).

16575736121 is an equidigital number, since it uses as much as digits as its factorization.

16575736121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338280343 (or 338280336 counting only the distinct ones).

The product of its digits is 264600, while the sum is 44.

The spelling of 16575736121 in words is "sixteen billion, five hundred seventy-five million, seven hundred thirty-six thousand, one hundred twenty-one".