16661006011 has 4 divisors (see below), whose sum is σ = 17942621872. Its totient is φ = 15379390152.

The previous prime is 16661005997. The next prime is 16661006027. The reversal of 16661006011 is 11060016661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11060016661 = 31 ⋅356774731.

It is a cyclic number.

It is not a de Polignac number, because 16661006011 - 2⁷ = 16661005883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661006081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640807911 + ... + 640807936.

It is an arithmetic number, because the mean of its divisors is an integer number (4485655468).

Almost surely, 2^16661006011 is an apocalyptic number.

16661006011 is a deficient number, since it is larger than the sum of its proper divisors (1281615861).

16661006011 is a wasteful number, since it uses less digits than its factorization.

16661006011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281615860.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 16661006011 in words is "sixteen billion, six hundred sixty-one million, six thousand, eleven".