16520404511 has 8 divisors (see below), whose sum is σ = 18564735840. Its totient is φ = 14586577632.

The previous prime is 16520404507. The next prime is 16520404519. The reversal of 16520404511 is 11540402561.

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 16520404511 - 2² = 16520404507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16520404519) 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, 27625796 + ... + 27626393.

It is an arithmetic number, because the mean of its divisors is an integer number (2320591980).

Almost surely, 2^16520404511 is an apocalyptic number.

16520404511 is a deficient number, since it is larger than the sum of its proper divisors (2044331329).

16520404511 is a wasteful number, since it uses less digits than its factorization.

16520404511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55252225.

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 16520404511 in words is "sixteen billion, five hundred twenty million, four hundred four thousand, five hundred eleven".