7153945561 has 27 divisors (see below), whose sum is σ = 8550398943. Its totient is φ = 5968035360.

The previous prime is 7153945549. The next prime is 7153945577. The reversal of 7153945561 is 1655493517.

The square root of 7153945561 is 84581.

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., 4834559961 + 2319385600 = 69531^2 + 48160^2 .

It is not a de Polignac number, because 7153945561 - 2²⁷ = 7019727833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7153925561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 25458741 + ... + 25459021.

Almost surely, 2^7153945561 is an apocalyptic number.

7153945561 is the 84581-st square number.

7153945561 is the 42291-st centered octagonal number.

It is an amenable number.

7153945561 is a deficient number, since it is larger than the sum of its proper divisors (1396453382).

7153945561 is an frugal number, since it uses more digits than its factorization.

7153945561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 331 counting only the distinct ones).

The product of its digits is 567000, while the sum is 46.

The cubic root of 7153945561 is about 1926.8528232377.

The spelling of 7153945561 in words is "seven billion, one hundred fifty-three million, nine hundred forty-five thousand, five hundred sixty-one".