1677666661 has 12 divisors (see below), whose sum is σ = 1848605472. Its totient is φ = 1509950000.

The previous prime is 1677666647. The next prime is 1677666721. The reversal of 1677666661 is 1666667761.

It is not a de Polignac number, because 1677666661 - 2¹¹ = 1677664613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1677666599 and 1677666608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1677666631) 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 11 ways as a sum of consecutive naturals, for example, 104736 + ... + 119686.

It is an arithmetic number, because the mean of its divisors is an integer number (154050456).

Almost surely, 2^1677666661 is an apocalyptic number.

1677666661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1677666661 is a deficient number, since it is larger than the sum of its proper divisors (170938811).

1677666661 is a wasteful number, since it uses less digits than its factorization.

1677666661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15164 (or 15063 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 52.

The square root of 1677666661 is about 40959.3293524198. The cubic root of 1677666661 is about 1188.2337710765.

It can be divided in two parts, 16 and 77666661, that added together give a palindrome (77666677).

The spelling of 1677666661 in words is "one billion, six hundred seventy-seven million, six hundred sixty-six thousand, six hundred sixty-one".