16666321101 has 4 divisors (see below), whose sum is σ = 22221761472. Its totient is φ = 11110880732.

The previous prime is 16666321099. The next prime is 16666321103. The reversal of 16666321101 is 10112366661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (16666321099) and next prime (16666321103).

It is a cyclic number.

It is not a de Polignac number, because 16666321101 - 2¹ = 16666321099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666321103) 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, 2777720181 + ... + 2777720186.

It is an arithmetic number, because the mean of its divisors is an integer number (5555440368).

Almost surely, 2^16666321101 is an apocalyptic number.

It is an amenable number.

16666321101 is a deficient number, since it is larger than the sum of its proper divisors (5555440371).

16666321101 is an equidigital number, since it uses as much as digits as its factorization.

16666321101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555440370.

The product of its (nonzero) digits is 7776, while the sum is 33.

Adding to 16666321101 its reverse (10112366661), we get a palindrome (26778687762).

The spelling of 16666321101 in words is "sixteen billion, six hundred sixty-six million, three hundred twenty-one thousand, one hundred one".