16661061643115 has 64 divisors (see below), whose sum is σ = 21527427220992. Its totient is φ = 12334838630400.

The previous prime is 16661061643103. The next prime is 16661061643151. The reversal of 16661061643115 is 51134616016661.

It is not a de Polignac number, because 16661061643115 - 2⁸ = 16661061642859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16661061643115.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 600752789 + ... + 600780521.

It is an arithmetic number, because the mean of its divisors is an integer number (336366050328).

Almost surely, 2^{16661061643115} is an apocalyptic number.

16661061643115 is a deficient number, since it is larger than the sum of its proper divisors (4866365577877).

16661061643115 is a wasteful number, since it uses less digits than its factorization.

16661061643115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28380.

The product of its (nonzero) digits is 466560, while the sum is 47.

Adding to 16661061643115 its reverse (51134616016661), we get a palindrome (67795677659776).

The spelling of 16661061643115 in words is "sixteen trillion, six hundred sixty-one billion, sixty-one million, six hundred forty-three thousand, one hundred fifteen".