6671561471 has 4 divisors (see below), whose sum is σ = 6730601952. Its totient is φ = 6612520992.

The previous prime is 6671561461. The next prime is 6671561489. The reversal of 6671561471 is 1741651766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1741651766 = 2 ⋅870825883.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6671561471 is a prime.

It is a super-3 number, since 3×6671561471³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6671561461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29520071 + ... + 29520296.

It is an arithmetic number, because the mean of its divisors is an integer number (1682650488).

Almost surely, 2^6671561471 is an apocalyptic number.

6671561471 is a deficient number, since it is larger than the sum of its proper divisors (59040481).

6671561471 is a wasteful number, since it uses less digits than its factorization.

6671561471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59040480.

The product of its digits is 211680, while the sum is 44.

The square root of 6671561471 is about 81679.6270253482. The cubic root of 6671561471 is about 1882.5325637993.

The spelling of 6671561471 in words is "six billion, six hundred seventy-one million, five hundred sixty-one thousand, four hundred seventy-one".