16275512521 has 4 divisors (see below), whose sum is σ = 16275964032. Its totient is φ = 16275061012.

The previous prime is 16275512509. The next prime is 16275512531. The reversal of 16275512521 is 12521557261.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12521557261 = 51767 ⋅241883.

It is a cyclic number.

It is not a de Polignac number, because 16275512521 - 2⁹ = 16275512009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16275512531) 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, 166501 + ... + 245506.

It is an arithmetic number, because the mean of its divisors is an integer number (4068991008).

Almost surely, 2^16275512521 is an apocalyptic number.

It is an amenable number.

16275512521 is a deficient number, since it is larger than the sum of its proper divisors (451511).

16275512521 is an equidigital number, since it uses as much as digits as its factorization.

16275512521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451510.

The product of its digits is 42000, while the sum is 37.

The spelling of 16275512521 in words is "sixteen billion, two hundred seventy-five million, five hundred twelve thousand, five hundred twenty-one".