639068259497 has 2 divisors, whose sum is σ = 639068259498. Its totient is φ = 639068259496.

The previous prime is 639068259493. The next prime is 639068259637. The reversal of 639068259497 is 794952860936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 593930707561 + 45137551936 = 770669^2 + 212456^2 .

It is a cyclic number.

It is not a de Polignac number, because 639068259497 - 2² = 639068259493 is a prime.

It is not a weakly prime, because it can be changed into another prime (639068259493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319534129748 + 319534129749.

It is an arithmetic number, because the mean of its divisors is an integer number (319534129749).

Almost surely, 2^639068259497 is an apocalyptic number.

It is an amenable number.

639068259497 is a deficient number, since it is larger than the sum of its proper divisors (1).

639068259497 is an equidigital number, since it uses as much as digits as its factorization.

639068259497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176359680, while the sum is 68.

The spelling of 639068259497 in words is "six hundred thirty-nine billion, sixty-eight million, two hundred fifty-nine thousand, four hundred ninety-seven".