16521650705 has 24 divisors (see below), whose sum is σ = 23599236672. Its totient is φ = 11065656672.

The previous prime is 16521650681. The next prime is 16521650741. The reversal of 16521650705 is 50705612561.

It is not a de Polignac number, because 16521650705 - 2⁶ = 16521650641 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 773597 + ... + 794666.

It is an arithmetic number, because the mean of its divisors is an integer number (983301528).

Almost surely, 2^16521650705 is an apocalyptic number.

It is an amenable number.

16521650705 is a deficient number, since it is larger than the sum of its proper divisors (7077585967).

16521650705 is a wasteful number, since it uses less digits than its factorization.

16521650705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568325 (or 1568318 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 38.

The spelling of 16521650705 in words is "sixteen billion, five hundred twenty-one million, six hundred fifty thousand, seven hundred five".