205120202120641 has 4 divisors (see below), whose sum is σ = 205131731574784. Its totient is φ = 205108672666500.

The previous prime is 205120202120593. The next prime is 205120202120651. The reversal of 205120202120641 is 146021202021502.

It is a happy number.

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 205120202120641 - 2⁹ = 205120202120129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205120202120651) 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, 5764700385 + ... + 5764735966.

It is an arithmetic number, because the mean of its divisors is an integer number (51282932893696).

Almost surely, 2^{205120202120641} is an apocalyptic number.

It is an amenable number.

205120202120641 is a deficient number, since it is larger than the sum of its proper divisors (11529454143).

205120202120641 is a wasteful number, since it uses less digits than its factorization.

205120202120641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11529454142.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 205120202120641 in words is "two hundred five trillion, one hundred twenty billion, two hundred two million, one hundred twenty thousand, six hundred forty-one".