16661055261806 has 8 divisors (see below), whose sum is σ = 24991696299504. Its totient is φ = 8330489828640.

The previous prime is 16661055261761. The next prime is 16661055261863. The reversal of 16661055261806 is 60816255016661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18346955 + ... + 19233638.

It is an arithmetic number, because the mean of its divisors is an integer number (3123962037438).

Almost surely, 2^{16661055261806} is an apocalyptic number.

16661055261806 is a deficient number, since it is larger than the sum of its proper divisors (8330641037698).

16661055261806 is a wasteful number, since it uses less digits than its factorization.

16661055261806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37802266.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 16661055261806 in words is "sixteen trillion, six hundred sixty-one billion, fifty-five million, two hundred sixty-one thousand, eight hundred six".