205444636145 has 16 divisors (see below), whose sum is σ = 281764167168. Its totient is φ = 140870560320.

The previous prime is 205444636141. The next prime is 205444636147. The reversal of 205444636145 is 541636444502.

It is not a de Polignac number, because 205444636145 - 2² = 205444636141 is a prime.

It is a super-2 number, since 2×205444636145² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205444636096 and 205444636105.

It is not an unprimeable number, because it can be changed into a prime (205444636141) 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, 860867 + ... + 1073303.

It is an arithmetic number, because the mean of its divisors is an integer number (17610260448).

Almost surely, 2^205444636145 is an apocalyptic number.

It is an amenable number.

205444636145 is a deficient number, since it is larger than the sum of its proper divisors (76319531023).

205444636145 is a wasteful number, since it uses less digits than its factorization.

205444636145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240080.

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 205444636145 in words is "two hundred five billion, four hundred forty-four million, six hundred thirty-six thousand, one hundred forty-five".