16721512265 has 8 divisors (see below), whose sum is σ = 20067661440. Its totient is φ = 13375978672.

The previous prime is 16721512261. The next prime is 16721512271. The reversal of 16721512265 is 56221512761.

16721512265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16721512265 - 2² = 16721512261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16721512261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91859 + ... + 204648.

It is an arithmetic number, because the mean of its divisors is an integer number (2508457680).

Almost surely, 2^16721512265 is an apocalyptic number.

It is an amenable number.

16721512265 is a deficient number, since it is larger than the sum of its proper divisors (3346149175).

16721512265 is a wasteful number, since it uses less digits than its factorization.

16721512265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307791.

The product of its digits is 50400, while the sum is 38.

The spelling of 16721512265 in words is "sixteen billion, seven hundred twenty-one million, five hundred twelve thousand, two hundred sixty-five".