64973689439 has 2 divisors, whose sum is σ = 64973689440. Its totient is φ = 64973689438.

The previous prime is 64973689387. The next prime is 64973689447. The reversal of 64973689439 is 93498637946.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64973689439 - 2¹⁶ = 64973623903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64973689939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32486844719 + 32486844720.

It is an arithmetic number, because the mean of its divisors is an integer number (32486844720).

Almost surely, 2^64973689439 is an apocalyptic number.

64973689439 is a deficient number, since it is larger than the sum of its proper divisors (1).

64973689439 is an equidigital number, since it uses as much as digits as its factorization.

64973689439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211631616, while the sum is 68.

The spelling of 64973689439 in words is "sixty-four billion, nine hundred seventy-three million, six hundred eighty-nine thousand, four hundred thirty-nine".