864721287487 has 2 divisors, whose sum is σ = 864721287488. Its totient is φ = 864721287486.

The previous prime is 864721287467. The next prime is 864721287631. The reversal of 864721287487 is 784782127468.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864721287487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864721287467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432360643743 + 432360643744.

It is an arithmetic number, because the mean of its divisors is an integer number (432360643744).

Almost surely, 2^864721287487 is an apocalyptic number.

864721287487 is a deficient number, since it is larger than the sum of its proper divisors (1).

864721287487 is an equidigital number, since it uses as much as digits as its factorization.

864721287487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67436544, while the sum is 64.

The spelling of 864721287487 in words is "eight hundred sixty-four billion, seven hundred twenty-one million, two hundred eighty-seven thousand, four hundred eighty-seven".