639770611 has 2 divisors, whose sum is σ = 639770612. Its totient is φ = 639770610.

The previous prime is 639770609. The next prime is 639770629. The reversal of 639770611 is 116077936.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639770611 - 2¹ = 639770609 is a prime.

Together with 639770609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (639770311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319885305 + 319885306.

It is an arithmetic number, because the mean of its divisors is an integer number (319885306).

Almost surely, 2^639770611 is an apocalyptic number.

639770611 is a deficient number, since it is larger than the sum of its proper divisors (1).

639770611 is an equidigital number, since it uses as much as digits as its factorization.

639770611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 639770611 is about 25293.6871768432. The cubic root of 639770611 is about 861.6709046221.

The spelling of 639770611 in words is "six hundred thirty-nine million, seven hundred seventy thousand, six hundred eleven".