16661990842 has 32 divisors (see below), whose sum is σ = 28650787200. Its totient is φ = 7119050688.

The previous prime is 16661990833. The next prime is 16661990843. The reversal of 16661990842 is 24809916661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16661990842.

It is not an unprimeable number, because it can be changed into a prime (16661990843) 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, 9982384 + ... + 9984052.

It is an arithmetic number, because the mean of its divisors is an integer number (895337100).

Almost surely, 2^16661990842 is an apocalyptic number.

16661990842 is a deficient number, since it is larger than the sum of its proper divisors (11988796358).

16661990842 is a wasteful number, since it uses less digits than its factorization.

16661990842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 16661990842 in words is "sixteen billion, six hundred sixty-one million, nine hundred ninety thousand, eight hundred forty-two".