16666321771 has 8 divisors (see below), whose sum is σ = 18183343104. Its totient is φ = 15149617320.

The previous prime is 16666321741. The next prime is 16666321781. The reversal of 16666321771 is 17712366661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16666321771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16666321741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38350 + ... + 186556.

It is an arithmetic number, because the mean of its divisors is an integer number (2272917888).

Almost surely, 2^16666321771 is an apocalyptic number.

16666321771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16666321771 is a deficient number, since it is larger than the sum of its proper divisors (1517021333).

16666321771 is a wasteful number, since it uses less digits than its factorization.

16666321771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158441.

The product of its digits is 381024, while the sum is 46.

The spelling of 16666321771 in words is "sixteen billion, six hundred sixty-six million, three hundred twenty-one thousand, seven hundred seventy-one".