639552581691587 has 2 divisors, whose sum is σ = 639552581691588. Its totient is φ = 639552581691586.

The previous prime is 639552581691493. The next prime is 639552581691701. The reversal of 639552581691587 is 785196185255936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639552581691587 - 2²⁴ = 639552564914371 is a prime.

It is not a weakly prime, because it can be changed into another prime (639552581691487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319776290845793 + 319776290845794.

It is an arithmetic number, because the mean of its divisors is an integer number (319776290845794).

Almost surely, 2^{639552581691587} is an apocalyptic number.

639552581691587 is a deficient number, since it is larger than the sum of its proper divisors (1).

639552581691587 is an equidigital number, since it uses as much as digits as its factorization.

639552581691587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880000, while the sum is 80.

The spelling of 639552581691587 in words is "six hundred thirty-nine trillion, five hundred fifty-two billion, five hundred eighty-one million, six hundred ninety-one thousand, five hundred eighty-seven".