639700606697 has 2 divisors, whose sum is σ = 639700606698. Its totient is φ = 639700606696.

The previous prime is 639700606691. The next prime is 639700606717. The reversal of 639700606697 is 796606007936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514341414976 + 125359191721 = 717176^2 + 354061^2 .

It is a cyclic number.

It is not a de Polignac number, because 639700606697 - 2⁴ = 639700606681 is a prime.

It is not a weakly prime, because it can be changed into another prime (639700606691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319850303348 + 319850303349.

It is an arithmetic number, because the mean of its divisors is an integer number (319850303349).

Almost surely, 2^639700606697 is an apocalyptic number.

It is an amenable number.

639700606697 is a deficient number, since it is larger than the sum of its proper divisors (1).

639700606697 is an equidigital number, since it uses as much as digits as its factorization.

639700606697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15431472, while the sum is 59.

The spelling of 639700606697 in words is "six hundred thirty-nine billion, seven hundred million, six hundred six thousand, six hundred ninety-seven".