16509423408 has 40 divisors (see below), whose sum is σ = 42835614000. Its totient is φ = 5479106304.

The previous prime is 16509423407. The next prime is 16509423431. The reversal of 16509423408 is 80432490561.

It is a super-2 number, since 2×16509423408² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16509423408.

It is not an unprimeable number, because it can be changed into a prime (16509423407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739983 + ... + 761966.

It is an arithmetic number, because the mean of its divisors is an integer number (1070890350).

Almost surely, 2^16509423408 is an apocalyptic number.

It is an amenable number.

16509423408 is an abundant number, since it is smaller than the sum of its proper divisors (26326190592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16509423408 is a wasteful number, since it uses less digits than its factorization.

16509423408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502189 (or 1502183 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 16509423408 in words is "sixteen billion, five hundred nine million, four hundred twenty-three thousand, four hundred eight".