721796054405 has 8 divisors (see below), whose sum is σ = 870940654584. Its totient is φ = 574246584000.

The previous prime is 721796054401. The next prime is 721796054407. The reversal of 721796054405 is 504450697127.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24105046564 + 697691007841 = 155258^2 + 835279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721796054405 - 2² = 721796054401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721796054401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398781446 + ... + 398783255.

It is an arithmetic number, because the mean of its divisors is an integer number (108867581823).

Almost surely, 2^721796054405 is an apocalyptic number.

It is an amenable number.

721796054405 is a deficient number, since it is larger than the sum of its proper divisors (149144600179).

721796054405 is a wasteful number, since it uses less digits than its factorization.

721796054405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797564887.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 721796054405 in words is "seven hundred twenty-one billion, seven hundred ninety-six million, fifty-four thousand, four hundred five".