6471275861 has 2 divisors, whose sum is σ = 6471275862. Its totient is φ = 6471275860.

The previous prime is 6471275849. The next prime is 6471275891. The reversal of 6471275861 is 1685721746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6127914961 + 343360900 = 78281^2 + 18530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6471275861 is a prime.

It is a super-2 number, since 2×6471275861² = 83754822538322582642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6471275891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3235637930 + 3235637931.

It is an arithmetic number, because the mean of its divisors is an integer number (3235637931).

Almost surely, 2^6471275861 is an apocalyptic number.

It is an amenable number.

6471275861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6471275861 is an equidigital number, since it uses as much as digits as its factorization.

6471275861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 47.

The square root of 6471275861 is about 80444.2406950305. The cubic root of 6471275861 is about 1863.5024633658.

The spelling of 6471275861 in words is "six billion, four hundred seventy-one million, two hundred seventy-five thousand, eight hundred sixty-one".