1671666661761 has 16 divisors (see below), whose sum is σ = 2360510490624. Its totient is φ = 1050080028624.

The previous prime is 1671666661759. The next prime is 1671666661793.

1671666661761 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1671666661761 - 2¹ = 1671666661759 is a prime.

It is a super-2 number, since 2×1671666661761² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1671666661695 and 1671666661704.

It is not an unprimeable number, because it can be changed into a prime (1671666661751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180794281 + ... + 180803526.

It is an arithmetic number, because the mean of its divisors is an integer number (147531905664).

Almost surely, 2^{1671666661761} is an apocalyptic number.

It is an amenable number.

1671666661761 is a deficient number, since it is larger than the sum of its proper divisors (688843828863).

1671666661761 is a wasteful number, since it uses less digits than its factorization.

1671666661761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361597900.

The product of its digits is 13716864, while the sum is 60.

The spelling of 1671666661761 in words is "one trillion, six hundred seventy-one billion, six hundred sixty-six million, six hundred sixty-one thousand, seven hundred sixty-one".