16523455117 has 4 divisors (see below), whose sum is σ = 17794490140. Its totient is φ = 15252420096.

The previous prime is 16523455103. The next prime is 16523455129. The reversal of 16523455117 is 71155432561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8612953636 + 7910501481 = 92806^2 + 88941^2 .

It is a cyclic number.

It is not a de Polignac number, because 16523455117 - 2⁷ = 16523454989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16523455117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16523455147) 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, 635517492 + ... + 635517517.

It is an arithmetic number, because the mean of its divisors is an integer number (4448622535).

Almost surely, 2^16523455117 is an apocalyptic number.

It is an amenable number.

16523455117 is a deficient number, since it is larger than the sum of its proper divisors (1271035023).

16523455117 is a wasteful number, since it uses less digits than its factorization.

16523455117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271035022.

The product of its digits is 126000, while the sum is 40.

Adding to 16523455117 its reverse (71155432561), we get a palindrome (87678887678).

The spelling of 16523455117 in words is "sixteen billion, five hundred twenty-three million, four hundred fifty-five thousand, one hundred seventeen".