16520666453 has 16 divisors (see below), whose sum is σ = 17921844864. Its totient is φ = 15171717120.

The previous prime is 16520666443. The next prime is 16520666483. The reversal of 16520666453 is 35466602561.

It is a cyclic number.

It is not a de Polignac number, because 16520666453 - 2¹² = 16520662357 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 (16520666443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46526 + ... + 187632.

It is an arithmetic number, because the mean of its divisors is an integer number (1120115304).

Almost surely, 2^16520666453 is an apocalyptic number.

It is an amenable number.

16520666453 is a deficient number, since it is larger than the sum of its proper divisors (1401178411).

16520666453 is a wasteful number, since it uses less digits than its factorization.

16520666453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141292.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 16520666453 in words is "sixteen billion, five hundred twenty million, six hundred sixty-six thousand, four hundred fifty-three".