7422818515225 has 9 divisors (see below), whose sum is σ = 9204311850717. Its totient is φ = 5938243914240.

The previous prime is 7422818515223. The next prime is 7422818515289. The reversal of 7422818515225 is 5225158182247.

The square root of 7422818515225 is 2724485.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 769906218249 + 6652912296976 = 877443^2 + 2579324^2 .

It is not a de Polignac number, because 7422818515225 - 2¹ = 7422818515223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7422818515223) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13349977 + ... + 13894873.

Almost surely, 2^{7422818515225} is an apocalyptic number.

7422818515225 is the 2724485-th square number.

7422818515225 is the 1362243-rd centered octagonal number.

It is an amenable number.

7422818515225 is a deficient number, since it is larger than the sum of its proper divisors (1781493335492).

7422818515225 is an frugal number, since it uses more digits than its factorization.

7422818515225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089804 (or 544902 counting only the distinct ones).

The product of its digits is 3584000, while the sum is 52.

The spelling of 7422818515225 in words is "seven trillion, four hundred twenty-two billion, eight hundred eighteen million, five hundred fifteen thousand, two hundred twenty-five".