727203778561 has 8 divisors (see below), whose sum is σ = 783155993984. Its totient is φ = 671253486480.

The previous prime is 727203778531. The next prime is 727203778573. The reversal of 727203778561 is 165877302727.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-727203778561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (727203778531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358750 + ... + 1258216.

It is an arithmetic number, because the mean of its divisors is an integer number (97894499248).

Almost surely, 2^727203778561 is an apocalyptic number.

It is an amenable number.

727203778561 is a deficient number, since it is larger than the sum of its proper divisors (55952215423).

727203778561 is a wasteful number, since it uses less digits than its factorization.

727203778561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961671.

The product of its (nonzero) digits is 6914880, while the sum is 55.

The spelling of 727203778561 in words is "seven hundred twenty-seven billion, two hundred three million, seven hundred seventy-eight thousand, five hundred sixty-one".