16505867964 has 24 divisors (see below), whose sum is σ = 38854524240. Its totient is φ = 5453265664.

The previous prime is 16505867941. The next prime is 16505867981. The reversal of 16505867964 is 46976850561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6084879 + ... + 6087590.

It is an arithmetic number, because the mean of its divisors is an integer number (1618938510).

Almost surely, 2^16505867964 is an apocalyptic number.

It is an amenable number.

16505867964 is an abundant number, since it is smaller than the sum of its proper divisors (22348656276).

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

16505867964 is a wasteful number, since it uses less digits than its factorization.

16505867964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12172589 (or 12172587 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 57.

The spelling of 16505867964 in words is "sixteen billion, five hundred five million, eight hundred sixty-seven thousand, nine hundred sixty-four".