721225986766 has 16 divisors (see below), whose sum is σ = 1108299386880. Its totient is φ = 351794033920.

The previous prime is 721225986763. The next prime is 721225986791. The reversal of 721225986766 is 667689522127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721225986763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 973110 + ... + 1545766.

It is an arithmetic number, because the mean of its divisors is an integer number (69268711680).

Almost surely, 2^721225986766 is an apocalyptic number.

721225986766 is a deficient number, since it is larger than the sum of its proper divisors (387073400114).

721225986766 is a wasteful number, since it uses less digits than its factorization.

721225986766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588059.

The product of its digits is 30481920, while the sum is 61.

The spelling of 721225986766 in words is "seven hundred twenty-one billion, two hundred twenty-five million, nine hundred eighty-six thousand, seven hundred sixty-six".