16536621453 has 24 divisors (see below), whose sum is σ = 24567521664. Its totient is φ = 9884888640.

The previous prime is 16536621391. The next prime is 16536621503. The reversal of 16536621453 is 35412663561.

It is not a de Polignac number, because 16536621453 - 2⁸ = 16536621197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16536621653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285525 + ... + 338522.

It is an arithmetic number, because the mean of its divisors is an integer number (1023646736).

Almost surely, 2^16536621453 is an apocalyptic number.

It is an amenable number.

16536621453 is a deficient number, since it is larger than the sum of its proper divisors (8030900211).

16536621453 is a wasteful number, since it uses less digits than its factorization.

16536621453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624145 (or 624134 counting only the distinct ones).

The product of its digits is 388800, while the sum is 42.

The spelling of 16536621453 in words is "sixteen billion, five hundred thirty-six million, six hundred twenty-one thousand, four hundred fifty-three".