721429364365 has 4 divisors (see below), whose sum is σ = 865715237244. Its totient is φ = 577143491488.

The previous prime is 721429364363. The next prime is 721429364371. The reversal of 721429364365 is 563463924127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 270546659881 + 450882704484 = 520141^2 + 671478^2 .

It is a cyclic number.

It is not a de Polignac number, because 721429364365 - 2¹ = 721429364363 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 (721429364363) 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 3 ways as a sum of consecutive naturals, for example, 72142936432 + ... + 72142936441.

It is an arithmetic number, because the mean of its divisors is an integer number (216428809311).

Almost surely, 2^721429364365 is an apocalyptic number.

It is an amenable number.

721429364365 is a deficient number, since it is larger than the sum of its proper divisors (144285872879).

721429364365 is a wasteful number, since it uses less digits than its factorization.

721429364365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144285872878.

The product of its digits is 6531840, while the sum is 52.

The spelling of 721429364365 in words is "seven hundred twenty-one billion, four hundred twenty-nine million, three hundred sixty-four thousand, three hundred sixty-five".