16564635247253 has 4 divisors (see below), whose sum is σ = 16565465034048. Its totient is φ = 16563805460460.

The previous prime is 16564635247243. The next prime is 16564635247289. The reversal of 16564635247253 is 35274253646561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16564635247253 - 2¹⁸ = 16564634985109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16564635247192 and 16564635247201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564635247243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414863453 + ... + 414903378.

It is an arithmetic number, because the mean of its divisors is an integer number (4141366258512).

Almost surely, 2^{16564635247253} is an apocalyptic number.

It is an amenable number.

16564635247253 is a deficient number, since it is larger than the sum of its proper divisors (829786795).

16564635247253 is an equidigital number, since it uses as much as digits as its factorization.

16564635247253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829786794.

The product of its digits is 108864000, while the sum is 59.

The spelling of 16564635247253 in words is "sixteen trillion, five hundred sixty-four billion, six hundred thirty-five million, two hundred forty-seven thousand, two hundred fifty-three".