3567981661 has 4 divisors (see below), whose sum is σ = 3601327392. Its totient is φ = 3534635932.

The previous prime is 3567981601. The next prime is 3567981689. The reversal of 3567981661 is 1661897653.

It is a happy number.

3567981661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1661897653 = 13 ⋅127838281.

It is a cyclic number.

It is not a de Polignac number, because 3567981661 - 2¹³ = 3567973469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3567981599 and 3567981608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3567981601) 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, 16672705 + ... + 16672918.

It is an arithmetic number, because the mean of its divisors is an integer number (900331848).

Almost surely, 2^3567981661 is an apocalyptic number.

It is an amenable number.

3567981661 is a deficient number, since it is larger than the sum of its proper divisors (33345731).

3567981661 is a wasteful number, since it uses less digits than its factorization.

3567981661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33345730.

The product of its digits is 1632960, while the sum is 52.

The square root of 3567981661 is about 59732.5845832909. The cubic root of 3567981661 is about 1528.0616319093.

The spelling of 3567981661 in words is "three billion, five hundred sixty-seven million, nine hundred eighty-one thousand, six hundred sixty-one".