6771661 has 12 divisors (see below), whose sum is σ = 7767252. Its totient is φ = 5880576.

The previous prime is 6771649. The next prime is 6771673. The reversal of 6771661 is 1661776.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6771649) and next prime (6771673).

It can be written as a sum of positive squares in 6 ways, for example, as 1102500 + 5669161 = 1050^2 + 2381^2 .

It is not a de Polignac number, because 6771661 - 2⁷ = 6771533 is a prime.

It is a super-3 number, since 3×6771661³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

6771661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6771631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1695 + ... + 4051.

It is an arithmetic number, because the mean of its divisors is an integer number (647271).

Almost surely, 2^6771661 is an apocalyptic number.

It is an amenable number.

6771661 is a deficient number, since it is larger than the sum of its proper divisors (995591).

6771661 is a wasteful number, since it uses less digits than its factorization.

6771661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400 (or 2387 counting only the distinct ones).

The product of its digits is 10584, while the sum is 34.

The square root of 6771661 is about 2602.2415337551. The cubic root of 6771661 is about 189.1900982918.

The spelling of 6771661 in words is "six million, seven hundred seventy-one thousand, six hundred sixty-one".