721785792941 has 2 divisors, whose sum is σ = 721785792942. Its totient is φ = 721785792940.

The previous prime is 721785792929. The next prime is 721785793007. The reversal of 721785792941 is 149297587127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 711963000841 + 9822792100 = 843779^2 + 99110^2 .

It is a cyclic number.

It is not a de Polignac number, because 721785792941 - 2²⁶ = 721718684077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721785792911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360892896470 + 360892896471.

It is an arithmetic number, because the mean of its divisors is an integer number (360892896471).

Almost surely, 2^721785792941 is an apocalyptic number.

It is an amenable number.

721785792941 is a deficient number, since it is larger than the sum of its proper divisors (1).

721785792941 is an equidigital number, since it uses as much as digits as its factorization.

721785792941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17781120, while the sum is 62.

The spelling of 721785792941 in words is "seven hundred twenty-one billion, seven hundred eighty-five million, seven hundred ninety-two thousand, nine hundred forty-one".