65684450687 has 2 divisors, whose sum is σ = 65684450688. Its totient is φ = 65684450686.

The previous prime is 65684450659. The next prime is 65684450701. The reversal of 65684450687 is 78605448656.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65684450687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65684450987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32842225343 + 32842225344.

It is an arithmetic number, because the mean of its divisors is an integer number (32842225344).

Almost surely, 2^65684450687 is an apocalyptic number.

65684450687 is a deficient number, since it is larger than the sum of its proper divisors (1).

65684450687 is an equidigital number, since it uses as much as digits as its factorization.

65684450687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38707200, while the sum is 59.

The spelling of 65684450687 in words is "sixty-five billion, six hundred eighty-four million, four hundred fifty thousand, six hundred eighty-seven".