7220842505681 has 10 divisors (see below), whose sum is σ = 8423815020882. Its totient is φ = 6189293574240.

The previous prime is 7220842505677. The next prime is 7220842505707. The reversal of 7220842505681 is 1865052480227.

It can be written as a sum of positive squares in only one way, i.e., 6790297872400 + 430544633281 = 2605820^2 + 656159^2 .

It is not a de Polignac number, because 7220842505681 - 2² = 7220842505677 is a prime.

It is a super-2 number, since 2×7220842505681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7220842505641) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1503713240 + ... + 1503718041.

Almost surely, 2^{7220842505681} is an apocalyptic number.

It is an amenable number.

7220842505681 is a deficient number, since it is larger than the sum of its proper divisors (1202972515201).

7220842505681 is an frugal number, since it uses more digits than its factorization.

7220842505681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007431309 (or 3007431288 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 7220842505681 in words is "seven trillion, two hundred twenty billion, eight hundred forty-two million, five hundred five thousand, six hundred eighty-one".