16506423505 has 32 divisors (see below), whose sum is σ = 23408461440. Its totient is φ = 11081154240.

The previous prime is 16506423499. The next prime is 16506423511. The reversal of 16506423505 is 50532460561.

It is an interprime number because it is at equal distance from previous prime (16506423499) and next prime (16506423511).

It is not a de Polignac number, because 16506423505 - 2³ = 16506423497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52534 + ... + 189136.

It is an arithmetic number, because the mean of its divisors is an integer number (731514420).

Almost surely, 2^16506423505 is an apocalyptic number.

It is an amenable number.

16506423505 is a deficient number, since it is larger than the sum of its proper divisors (6902037935).

16506423505 is a wasteful number, since it uses less digits than its factorization.

16506423505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136658 (or 136632 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 16506423505 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, five hundred five".