63438439679 has 2 divisors, whose sum is σ = 63438439680. Its totient is φ = 63438439678.

The previous prime is 63438439627. The next prime is 63438439699. The reversal of 63438439679 is 97693483436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63438439679 - 2⁸ = 63438439423 is a prime.

It is a super-2 number, since 2×63438439679² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63438439609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31719219839 + 31719219840.

It is an arithmetic number, because the mean of its divisors is an integer number (31719219840).

Almost surely, 2^63438439679 is an apocalyptic number.

63438439679 is a deficient number, since it is larger than the sum of its proper divisors (1).

63438439679 is an equidigital number, since it uses as much as digits as its factorization.

63438439679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70543872, while the sum is 62.

The spelling of 63438439679 in words is "sixty-three billion, four hundred thirty-eight million, four hundred thirty-nine thousand, six hundred seventy-nine".