87556865639 has 2 divisors, whose sum is σ = 87556865640. Its totient is φ = 87556865638.

The previous prime is 87556865573. The next prime is 87556865659. The reversal of 87556865639 is 93656865578.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87556865639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87556865659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43778432819 + 43778432820.

It is an arithmetic number, because the mean of its divisors is an integer number (43778432820).

Almost surely, 2^87556865639 is an apocalyptic number.

87556865639 is a deficient number, since it is larger than the sum of its proper divisors (1).

87556865639 is an equidigital number, since it uses as much as digits as its factorization.

87556865639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592000, while the sum is 68.

The spelling of 87556865639 in words is "eighty-seven billion, five hundred fifty-six million, eight hundred sixty-five thousand, six hundred thirty-nine".