3566261451661 has 4 divisors (see below), whose sum is σ = 3566691285372. Its totient is φ = 3565831617952.

The previous prime is 3566261451589. The next prime is 3566261451673. The reversal of 3566261451661 is 1661541626653.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3113777868100 + 452483583561 = 1764590^2 + 672669^2 .

It is a cyclic number.

It is not a de Polignac number, because 3566261451661 - 2⁹ = 3566261451149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3566261451599 and 3566261451608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3566261455661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214904410 + ... + 214921003.

It is an arithmetic number, because the mean of its divisors is an integer number (891672821343).

Almost surely, 2^{3566261451661} is an apocalyptic number.

It is an amenable number.

3566261451661 is a deficient number, since it is larger than the sum of its proper divisors (429833711).

3566261451661 is an equidigital number, since it uses as much as digits as its factorization.

3566261451661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429833710.

The product of its digits is 4665600, while the sum is 52.

The spelling of 3566261451661 in words is "three trillion, five hundred sixty-six billion, two hundred sixty-one million, four hundred fifty-one thousand, six hundred sixty-one".