16500523561 has 8 divisors (see below), whose sum is σ = 17484574464. Its totient is φ = 15517965120.

The previous prime is 16500523547. The next prime is 16500523643. The reversal of 16500523561 is 16532500561.

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 16500523561 - 2¹⁵ = 16500490793 is a prime.

It is a super-2 number, since 2×16500523561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16500523511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350305 + ... + 394606.

It is an arithmetic number, because the mean of its divisors is an integer number (2185571808).

Almost surely, 2^16500523561 is an apocalyptic number.

It is an amenable number.

16500523561 is a deficient number, since it is larger than the sum of its proper divisors (984050903).

16500523561 is a wasteful number, since it uses less digits than its factorization.

16500523561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746231.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 16500523561 in words is "sixteen billion, five hundred million, five hundred twenty-three thousand, five hundred sixty-one".