721864686143 has 2 divisors, whose sum is σ = 721864686144. Its totient is φ = 721864686142.

The previous prime is 721864686107. The next prime is 721864686173. The reversal of 721864686143 is 341686468127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721864686143 - 2⁶ = 721864686079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721864686173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360932343071 + 360932343072.

It is an arithmetic number, because the mean of its divisors is an integer number (360932343072).

Almost surely, 2^721864686143 is an apocalyptic number.

721864686143 is a deficient number, since it is larger than the sum of its proper divisors (1).

721864686143 is an equidigital number, since it uses as much as digits as its factorization.

721864686143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 56.

The spelling of 721864686143 in words is "seven hundred twenty-one billion, eight hundred sixty-four million, six hundred eighty-six thousand, one hundred forty-three".