16623917534 has 36 divisors (see below), whose sum is σ = 30288057576. Its totient is φ = 6702137664.

The previous prime is 16623917507. The next prime is 16623917537. The reversal of 16623917534 is 43571932661.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16623917537) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8200229 + ... + 8202255.

Almost surely, 2^16623917534 is an apocalyptic number.

16623917534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

16623917534 is a deficient number, since it is larger than the sum of its proper divisors (13664140042).

16623917534 is an frugal number, since it uses more digits than its factorization.

16623917534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097 (or 2053 counting only the distinct ones).

The product of its digits is 816480, while the sum is 47.

The spelling of 16623917534 in words is "sixteen billion, six hundred twenty-three million, nine hundred seventeen thousand, five hundred thirty-four".