64642446287 has 2 divisors, whose sum is σ = 64642446288. Its totient is φ = 64642446286.

The previous prime is 64642446233. The next prime is 64642446301. The reversal of 64642446287 is 78264424646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64642446287 - 2⁶ = 64642446223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64642440287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32321223143 + 32321223144.

It is an arithmetic number, because the mean of its divisors is an integer number (32321223144).

Almost surely, 2^64642446287 is an apocalyptic number.

64642446287 is a deficient number, since it is larger than the sum of its proper divisors (1).

64642446287 is an equidigital number, since it uses as much as digits as its factorization.

64642446287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12386304, while the sum is 53.

The spelling of 64642446287 in words is "sixty-four billion, six hundred forty-two million, four hundred forty-six thousand, two hundred eighty-seven".