721440772773 has 12 divisors (see below), whose sum is σ = 1118969362080. Its totient is φ = 412251870072.

The previous prime is 721440772771. The next prime is 721440772807. The reversal of 721440772773 is 377277044127.

It is not a de Polignac number, because 721440772773 - 2¹ = 721440772771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721440772771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2453880033 + ... + 2453880326.

It is an arithmetic number, because the mean of its divisors is an integer number (93247446840).

Almost surely, 2^721440772773 is an apocalyptic number.

It is an amenable number.

721440772773 is a deficient number, since it is larger than the sum of its proper divisors (397528589307).

721440772773 is a wasteful number, since it uses less digits than its factorization.

721440772773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907760376 (or 4907760369 counting only the distinct ones).

The product of its (nonzero) digits is 3226944, while the sum is 51.

The spelling of 721440772773 in words is "seven hundred twenty-one billion, four hundred forty million, seven hundred seventy-two thousand, seven hundred seventy-three".