16505087004 has 72 divisors (see below), whose sum is σ = 48001480800. Its totient is φ = 4684079232.

The previous prime is 16505086979. The next prime is 16505087023. The reversal of 16505087004 is 40078050561.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 16505087004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182239 + ... + 257334.

Almost surely, 2^16505087004 is an apocalyptic number.

16505087004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16505087004 is an abundant number, since it is smaller than the sum of its proper divisors (31496393796).

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

16505087004 is a wasteful number, since it uses less digits than its factorization.

16505087004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439739 (or 439734 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 16505087004 in words is "sixteen billion, five hundred five million, eighty-seven thousand, four".