16501635138 has 16 divisors (see below), whose sum is σ = 33028156800. Its totient is φ = 5496397296.

The previous prime is 16501635119. The next prime is 16501635167. The reversal of 16501635138 is 83153610561.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16501635096 and 16501635105.

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, 1028313 + ... + 1044236.

It is an arithmetic number, because the mean of its divisors is an integer number (2064259800).

Almost surely, 2^16501635138 is an apocalyptic number.

16501635138 is an abundant number, since it is smaller than the sum of its proper divisors (16526521662).

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

16501635138 is a wasteful number, since it uses less digits than its factorization.

16501635138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073881.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 16501635138 in words is "sixteen billion, five hundred one million, six hundred thirty-five thousand, one hundred thirty-eight".