638614054679 has 2 divisors, whose sum is σ = 638614054680. Its totient is φ = 638614054678.

The previous prime is 638614054651. The next prime is 638614054681. The reversal of 638614054679 is 976450416836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638614054679 - 2¹² = 638614050583 is a prime.

It is a super-3 number, since 3×638614054679³ (a number of 36 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 638614054681, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638614054079) 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, 319307027339 + 319307027340.

It is an arithmetic number, because the mean of its divisors is an integer number (319307027340).

Almost surely, 2^638614054679 is an apocalyptic number.

638614054679 is a deficient number, since it is larger than the sum of its proper divisors (1).

638614054679 is an equidigital number, since it uses as much as digits as its factorization.

638614054679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 638614054679 in words is "six hundred thirty-eight billion, six hundred fourteen million, fifty-four thousand, six hundred seventy-nine".