721352105465 has 4 divisors (see below), whose sum is σ = 865622526564. Its totient is φ = 577081684368.

The previous prime is 721352105429. The next prime is 721352105471. The reversal of 721352105465 is 564501253127.

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 271744306681 + 449607798784 = 521291^2 + 670528^2 .

It is a cyclic number.

It is not a de Polignac number, because 721352105465 - 2¹⁰ = 721352104441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72135210542 + ... + 72135210551.

It is an arithmetic number, because the mean of its divisors is an integer number (216405631641).

Almost surely, 2^721352105465 is an apocalyptic number.

It is an amenable number.

721352105465 is a deficient number, since it is larger than the sum of its proper divisors (144270421099).

721352105465 is a wasteful number, since it uses less digits than its factorization.

721352105465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144270421098.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 721352105465 in words is "seven hundred twenty-one billion, three hundred fifty-two million, one hundred five thousand, four hundred sixty-five".