64707638999 has 2 divisors, whose sum is σ = 64707639000. Its totient is φ = 64707638998.

The previous prime is 64707638953. The next prime is 64707639001. The reversal of 64707638999 is 99983670746.

64707638999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64707638999 - 2¹² = 64707634903 is a prime.

Together with 64707639001, 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 (64707638939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32353819499 + 32353819500.

It is an arithmetic number, because the mean of its divisors is an integer number (32353819500).

Almost surely, 2^64707638999 is an apocalyptic number.

64707638999 is a deficient number, since it is larger than the sum of its proper divisors (1).

64707638999 is an equidigital number, since it uses as much as digits as its factorization.

64707638999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123451776, while the sum is 68.

The spelling of 64707638999 in words is "sixty-four billion, seven hundred seven million, six hundred thirty-eight thousand, nine hundred ninety-nine".