726307717561 has 12 divisors (see below), whose sum is σ = 752487238672. Its totient is φ = 701010165744.

The previous prime is 726307717559. The next prime is 726307717567. The reversal of 726307717561 is 165717703627.

It is not a de Polignac number, because 726307717561 - 2¹ = 726307717559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 726307717499 and 726307717508.

It is not an unprimeable number, because it can be changed into a prime (726307717567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2203270 + ... + 2511376.

Almost surely, 2^726307717561 is an apocalyptic number.

It is an amenable number.

726307717561 is a deficient number, since it is larger than the sum of its proper divisors (26179521111).

726307717561 is a wasteful number, since it uses less digits than its factorization.

726307717561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310968 (or 310939 counting only the distinct ones).

The product of its (nonzero) digits is 2593080, while the sum is 52.

The spelling of 726307717561 in words is "seven hundred twenty-six billion, three hundred seven million, seven hundred seventeen thousand, five hundred sixty-one".