722064927521 has 48 divisors (see below), whose sum is σ = 869071354704. Its totient is φ = 597849348096.

The previous prime is 722064927491. The next prime is 722064927539. The reversal of 722064927521 is 125729460227.

It can be written as a sum of positive squares in 8 ways, for example, as 169962430225 + 552102497296 = 412265^2 + 743036^2 .

It is a de Polignac number, because none of the positive numbers 2^k-722064927521 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (722064957521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116968391 + ... + 116974563.

It is an arithmetic number, because the mean of its divisors is an integer number (18105653223).

Almost surely, 2^722064927521 is an apocalyptic number.

It is an amenable number.

722064927521 is a deficient number, since it is larger than the sum of its proper divisors (147006427183).

722064927521 is a wasteful number, since it uses less digits than its factorization.

722064927521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930 (or 6923 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 722064927521 in words is "seven hundred twenty-two billion, sixty-four million, nine hundred twenty-seven thousand, five hundred twenty-one".