3642967561 has 4 divisors (see below), whose sum is σ = 3711702852. Its totient is φ = 3574232272.

The previous prime is 3642967543. The next prime is 3642967577. The reversal of 3642967561 is 1657692463.

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 2367406336 + 1275561225 = 48656^2 + 35715^2 .

It is a cyclic number.

It is not a de Polignac number, because 3642967561 - 2²³ = 3634578953 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3642967661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34367566 + ... + 34367671.

It is an arithmetic number, because the mean of its divisors is an integer number (927925713).

Almost surely, 2^3642967561 is an apocalyptic number.

It is an amenable number.

3642967561 is a deficient number, since it is larger than the sum of its proper divisors (68735291).

3642967561 is an equidigital number, since it uses as much as digits as its factorization.

3642967561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68735290.

The product of its digits is 1632960, while the sum is 49.

The square root of 3642967561 is about 60357.0009278128. Note that the first 3 decimals coincide. The cubic root of 3642967561 is about 1538.6922558803.

The spelling of 3642967561 in words is "three billion, six hundred forty-two million, nine hundred sixty-seven thousand, five hundred sixty-one".