205415541661 has 32 divisors (see below), whose sum is σ = 239708823552. Its totient is φ = 174174960960.

The previous prime is 205415541659. The next prime is 205415541673. The reversal of 205415541661 is 166145514502.

It is not a de Polignac number, because 205415541661 - 2¹ = 205415541659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205415541691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2138676 + ... + 2232658.

It is an arithmetic number, because the mean of its divisors is an integer number (7490900736).

Almost surely, 2^205415541661 is an apocalyptic number.

It is an amenable number.

205415541661 is a deficient number, since it is larger than the sum of its proper divisors (34293281891).

205415541661 is a wasteful number, since it uses less digits than its factorization.

205415541661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94233.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 205415541661 in words is "two hundred five billion, four hundred fifteen million, five hundred forty-one thousand, six hundred sixty-one".