16520511545 has 16 divisors (see below), whose sum is σ = 20234722752. Its totient is φ = 12943894080.

The previous prime is 16520511523. The next prime is 16520511559. The reversal of 16520511545 is 54511502561.

It is not a de Polignac number, because 16520511545 - 2¹² = 16520507449 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 93830 + ... + 204560.

It is an arithmetic number, because the mean of its divisors is an integer number (1264670172).

Almost surely, 2^16520511545 is an apocalyptic number.

It is an amenable number.

16520511545 is a deficient number, since it is larger than the sum of its proper divisors (3714211207).

16520511545 is a wasteful number, since it uses less digits than its factorization.

16520511545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111352.

The product of its (nonzero) digits is 30000, while the sum is 35.

The spelling of 16520511545 in words is "sixteen billion, five hundred twenty million, five hundred eleven thousand, five hundred forty-five".