725221347769 has 2 divisors, whose sum is σ = 725221347770. Its totient is φ = 725221347768.

The previous prime is 725221347703. The next prime is 725221347791. The reversal of 725221347769 is 967743122527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658856890000 + 66364457769 = 811700^2 + 257613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725221347769 is a prime.

It is a super-2 number, since 2×725221347769² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (725221347469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362610673884 + 362610673885.

It is an arithmetic number, because the mean of its divisors is an integer number (362610673885).

Almost surely, 2^725221347769 is an apocalyptic number.

It is an amenable number.

725221347769 is a deficient number, since it is larger than the sum of its proper divisors (1).

725221347769 is an equidigital number, since it uses as much as digits as its factorization.

725221347769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8890560, while the sum is 55.

The spelling of 725221347769 in words is "seven hundred twenty-five billion, two hundred twenty-one million, three hundred forty-seven thousand, seven hundred sixty-nine".