16913138523 has 4 divisors (see below), whose sum is σ = 22550851368. Its totient is φ = 11275425680.

The previous prime is 16913138507. The next prime is 16913138537. The reversal of 16913138523 is 32583131961.

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

It is a cyclic number.

It is not a de Polignac number, because 16913138523 - 2⁴ = 16913138507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16913138023) 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, 2818856418 + ... + 2818856423.

It is an arithmetic number, because the mean of its divisors is an integer number (5637712842).

Almost surely, 2^16913138523 is an apocalyptic number.

16913138523 is a deficient number, since it is larger than the sum of its proper divisors (5637712845).

16913138523 is an equidigital number, since it uses as much as digits as its factorization.

16913138523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637712844.

The product of its digits is 116640, while the sum is 42.

The spelling of 16913138523 in words is "sixteen billion, nine hundred thirteen million, one hundred thirty-eight thousand, five hundred twenty-three".