3661061621 has 16 divisors (see below), whose sum is σ = 4200920064. Its totient is φ = 3125447424.

The previous prime is 3661061597. The next prime is 3661061629. The reversal of 3661061621 is 1261601663.

It is a cyclic number.

It is not a de Polignac number, because 3661061621 - 2¹⁴ = 3661045237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661061629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2518931 + ... + 2520383.

It is an arithmetic number, because the mean of its divisors is an integer number (262557504).

Almost surely, 2^3661061621 is an apocalyptic number.

It is an amenable number.

3661061621 is a deficient number, since it is larger than the sum of its proper divisors (539858443).

3661061621 is a wasteful number, since it uses less digits than its factorization.

3661061621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 3661061621 is about 60506.7072397763. The cubic root of 3661061621 is about 1541.2355324811.

The spelling of 3661061621 in words is "three billion, six hundred sixty-one million, sixty-one thousand, six hundred twenty-one".