7266782315809 has 3 divisors (see below), whose sum is σ = 7266785011507. Its totient is φ = 7266779620112.

The previous prime is 7266782315789. The next prime is 7266782315867. The reversal of 7266782315809 is 9085132876627.

The square root of 7266782315809 is 2695697.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5908326797025 + 1358455518784 = 2430705^2 + 1165528^2 .

It is not a de Polignac number, because 7266782315809 - 2¹⁷ = 7266782184737 is a prime.

It is a super-2 number, since 2×7266782315809² (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 (7266782312809) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1347849 + ... + 4043545.

Almost surely, 2^{7266782315809} is an apocalyptic number.

7266782315809 is the 2695697-th square number.

7266782315809 is the 1347849-th centered octagonal number.

It is an amenable number.

7266782315809 is a deficient number, since it is larger than the sum of its proper divisors (2695698).

7266782315809 is an frugal number, since it uses more digits than its factorization.

7266782315809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391394 (or 2695697 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 64.

Multiplying 7266782315809 by its sum of digits (64), we get a square (465074068211776 = 21565576²).

The spelling of 7266782315809 in words is "seven trillion, two hundred sixty-six billion, seven hundred eighty-two million, three hundred fifteen thousand, eight hundred nine".