7149842818561 has 9 divisors (see below), whose sum is σ = 7213980564739. Its totient is φ = 7086270394336.

The previous prime is 7149842818529. The next prime is 7149842818579. The reversal of 7149842818561 is 1658182489417.

The square root of 7149842818561 is 2673919.

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

It can be written as a sum of positive squares in only one way, i.e., 125985953025 + 7023856865536 = 354945^2 + 2650256^2 .

It is not a de Polignac number, because 7149842818561 - 2⁵ = 7149842818529 is a prime.

It is a super-2 number, since 2×7149842818561² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7149842818493 and 7149842818502.

It is not an unprimeable number, because it can be changed into a prime (7149842815561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 302141016 + ... + 302164678.

Almost surely, 2^{7149842818561} is an apocalyptic number.

7149842818561 is the 2673919-th square number.

7149842818561 is the 1336960-th centered octagonal number.

It is an amenable number.

7149842818561 is a deficient number, since it is larger than the sum of its proper divisors (64137746178).

7149842818561 is an frugal number, since it uses more digits than its factorization.

7149842818561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47552 (or 23776 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 64.

Multiplying 7149842818561 by its sum of digits (64), we get a square (457589940387904 = 21391352²).

The spelling of 7149842818561 in words is "seven trillion, one hundred forty-nine billion, eight hundred forty-two million, eight hundred eighteen thousand, five hundred sixty-one".