16611001506 has 64 divisors (see below), whose sum is σ = 40294316160. Its totient is φ = 5030484480.

The previous prime is 16611001499. The next prime is 16611001507. The reversal of 16611001506 is 60510011661.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 16611001506.

It is not an unprimeable number, because it can be changed into a prime (16611001507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1047670 + ... + 1063406.

It is an arithmetic number, because the mean of its divisors is an integer number (629598690).

Almost surely, 2^16611001506 is an apocalyptic number.

16611001506 is an abundant number, since it is smaller than the sum of its proper divisors (23683314654).

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

16611001506 is a wasteful number, since it uses less digits than its factorization.

16611001506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17536 (or 17530 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 16611001506 in words is "sixteen billion, six hundred eleven million, one thousand, five hundred six".