3661742655661 has 4 divisors (see below), whose sum is σ = 3662844597792. Its totient is φ = 3660640713532.

The previous prime is 3661742655589. The next prime is 3661742655671. The reversal of 3661742655661 is 1665562471663.

It is a happy number.

3661742655661 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.

It is a cyclic number.

It is not a de Polignac number, because 3661742655661 - 2⁹ = 3661742655149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3661742655596 and 3661742655605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661742655671) 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, 550966081 + ... + 550972726.

It is an arithmetic number, because the mean of its divisors is an integer number (915711149448).

Almost surely, 2^{3661742655661} is an apocalyptic number.

It is an amenable number.

3661742655661 is a deficient number, since it is larger than the sum of its proper divisors (1101942131).

3661742655661 is a wasteful number, since it uses less digits than its factorization.

3661742655661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101942130.

The product of its digits is 32659200, while the sum is 58.

The spelling of 3661742655661 in words is "three trillion, six hundred sixty-one billion, seven hundred forty-two million, six hundred fifty-five thousand, six hundred sixty-one".