16667811876661 has 4 divisors (see below), whose sum is σ = 18183067501824. Its totient is φ = 15152556251500.

The previous prime is 16667811876637. The next prime is 16667811876671.

It is a happy number.

16667811876661 is nontrivially palindromic in base 10.

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 a cyclic number.

It is not a de Polignac number, because 16667811876661 - 2¹³ = 16667811868469 is a prime.

It is a super-2 number, since 2×16667811876661² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16667811876671) 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, 757627812565 + ... + 757627812586.

It is an arithmetic number, because the mean of its divisors is an integer number (4545766875456).

Almost surely, 2^{16667811876661} is an apocalyptic number.

16667811876661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16667811876661 is a deficient number, since it is larger than the sum of its proper divisors (1515255625163).

16667811876661 is a wasteful number, since it uses less digits than its factorization.

16667811876661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515255625162.

The product of its digits is 146313216, while the sum is 70.

The spelling of 16667811876661 in words is "sixteen trillion, six hundred sixty-seven billion, eight hundred eleven million, eight hundred seventy-six thousand, six hundred sixty-one".