6456520687 has 2 divisors, whose sum is σ = 6456520688. Its totient is φ = 6456520686.

The previous prime is 6456520669. The next prime is 6456520699. The reversal of 6456520687 is 7860256546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6456520687 - 2¹⁹ = 6455996399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6456520687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6456520607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3228260343 + 3228260344.

It is an arithmetic number, because the mean of its divisors is an integer number (3228260344).

Almost surely, 2^6456520687 is an apocalyptic number.

6456520687 is a deficient number, since it is larger than the sum of its proper divisors (1).

6456520687 is an equidigital number, since it uses as much as digits as its factorization.

6456520687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The square root of 6456520687 is about 80352.4777900470. The cubic root of 6456520687 is about 1862.0850598361.

The spelling of 6456520687 in words is "six billion, four hundred fifty-six million, five hundred twenty thousand, six hundred eighty-seven".