6440212487 has 2 divisors, whose sum is σ = 6440212488. Its totient is φ = 6440212486.

The previous prime is 6440212481. The next prime is 6440212591. The reversal of 6440212487 is 7842120446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6440212487 - 2⁶ = 6440212423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6440212487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440212481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220106243 + 3220106244.

It is an arithmetic number, because the mean of its divisors is an integer number (3220106244).

Almost surely, 2^6440212487 is an apocalyptic number.

6440212487 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440212487 is an equidigital number, since it uses as much as digits as its factorization.

6440212487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86016, while the sum is 38.

The square root of 6440212487 is about 80250.9344930014. The cubic root of 6440212487 is about 1860.5159557376.

The spelling of 6440212487 in words is "six billion, four hundred forty million, two hundred twelve thousand, four hundred eighty-seven".