6516661471 has 4 divisors (see below), whose sum is σ = 6519248944. Its totient is φ = 6514074000.

The previous prime is 6516661457. The next prime is 6516661499. The reversal of 6516661471 is 1741666156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6516661471 - 2¹¹ = 6516659423 is a prime.

It is a super-3 number, since 3×6516661471³ (a number of 30 digits) contains 333 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 (6516661871) 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, 1289955 + ... + 1294996.

It is an arithmetic number, because the mean of its divisors is an integer number (1629812236).

Almost surely, 2^6516661471 is an apocalyptic number.

6516661471 is a deficient number, since it is larger than the sum of its proper divisors (2587473).

6516661471 is a wasteful number, since it uses less digits than its factorization.

6516661471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587472.

The product of its digits is 181440, while the sum is 43.

The square root of 6516661471 is about 80725.8414078169. The cubic root of 6516661471 is about 1867.8488108550.

The spelling of 6516661471 in words is "six billion, five hundred sixteen million, six hundred sixty-one thousand, four hundred seventy-one".