205216866687 has 16 divisors (see below), whose sum is σ = 314348654592. Its totient is φ = 116652816480.

The previous prime is 205216866683. The next prime is 205216866689. The reversal of 205216866687 is 786668612502.

It is not a de Polignac number, because 205216866687 - 2² = 205216866683 is a prime.

It is a super-2 number, since 2×205216866687² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205216866683) 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, 25577748 + ... + 25585769.

It is an arithmetic number, because the mean of its divisors is an integer number (19646790912).

Almost surely, 2^205216866687 is an apocalyptic number.

205216866687 is a deficient number, since it is larger than the sum of its proper divisors (109131787905).

205216866687 is a wasteful number, since it uses less digits than its factorization.

205216866687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51163718.

The product of its (nonzero) digits is 11612160, while the sum is 57.

The spelling of 205216866687 in words is "two hundred five billion, two hundred sixteen million, eight hundred sixty-six thousand, six hundred eighty-seven".