2669685561 has 15 divisors (see below), whose sum is σ = 3988743583. Its totient is φ = 1779480360.

The previous prime is 2669685553. The next prime is 2669685581. The reversal of 2669685561 is 1655869662.

The square root of 2669685561 is 51669.

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

2669685561 is a `hidden beast` number, since 26 + 6 + 9 + 68 + 556 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1334513961 + 1335171600 = 36531^2 + 36540^2 .

It is not a de Polignac number, because 2669685561 - 2³ = 2669685553 is a prime.

It is a super-2 number, since 2×2669685561² = 14254441989223769442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2669685498 and 2669685507.

It is not an unprimeable number, because it can be changed into a prime (2669685511) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 462151 + ... + 467891.

Almost surely, 2^2669685561 is an apocalyptic number.

2669685561 is the 51669-th square number.

2669685561 is the 25835-th centered octagonal number.

It is an amenable number.

2669685561 is a deficient number, since it is larger than the sum of its proper divisors (1319058022).

2669685561 is an frugal number, since it uses more digits than its factorization.

2669685561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11494 (or 5744 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The cubic root of 2669685561 is about 1387.2456474589.

The spelling of 2669685561 in words is "two billion, six hundred sixty-nine million, six hundred eighty-five thousand, five hundred sixty-one".