16504509858 has 32 divisors (see below), whose sum is σ = 33913748736. Its totient is φ = 5350825728.

The previous prime is 16504509851. The next prime is 16504509869. The reversal of 16504509858 is 85890540561.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16504509858.

It is not an unprimeable number, because it can be changed into a prime (16504509851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658810 + ... + 683402.

It is an arithmetic number, because the mean of its divisors is an integer number (1059804648).

Almost surely, 2^16504509858 is an apocalyptic number.

16504509858 is an abundant number, since it is smaller than the sum of its proper divisors (17409238878).

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

16504509858 is a wasteful number, since it uses less digits than its factorization.

16504509858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27658.

The product of its (nonzero) digits is 1728000, while the sum is 51.

The spelling of 16504509858 in words is "sixteen billion, five hundred four million, five hundred nine thousand, eight hundred fifty-eight".