16661071751305 has 4 divisors (see below), whose sum is σ = 19993286101572. Its totient is φ = 13328857401040.

The previous prime is 16661071751273. The next prime is 16661071751321. The reversal of 16661071751305 is 50315717016661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11332864410624 + 5328207340681 = 3366432^2 + 2308291^2 .

It is not a de Polignac number, because 16661071751305 - 2⁵ = 16661071751273 is a prime.

It is a Duffinian 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, 1666107175126 + ... + 1666107175135.

It is an arithmetic number, because the mean of its divisors is an integer number (4998321525393).

Almost surely, 2^{16661071751305} is an apocalyptic number.

It is an amenable number.

16661071751305 is a deficient number, since it is larger than the sum of its proper divisors (3332214350267).

16661071751305 is an equidigital number, since it uses as much as digits as its factorization.

16661071751305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332214350266.

The product of its (nonzero) digits is 793800, while the sum is 49.

Adding to 16661071751305 its reverse (50315717016661), we get a palindrome (66976788767966).

The spelling of 16661071751305 in words is "sixteen trillion, six hundred sixty-one billion, seventy-one million, seven hundred fifty-one thousand, three hundred five".