205984312743 has 24 divisors (see below), whose sum is σ = 318274611840. Its totient is φ = 117495502720.

The previous prime is 205984312739. The next prime is 205984312753. The reversal of 205984312743 is 347213489502.

It is not a de Polignac number, because 205984312743 - 2² = 205984312739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205984312692 and 205984312701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205984312753) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10789683 + ... + 10808756.

It is an arithmetic number, because the mean of its divisors is an integer number (13261442160).

Almost surely, 2^205984312743 is an apocalyptic number.

205984312743 is a deficient number, since it is larger than the sum of its proper divisors (112290299097).

205984312743 is a wasteful number, since it uses less digits than its factorization.

205984312743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21598487 (or 21598470 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 205984312743 in words is "two hundred five billion, nine hundred eighty-four million, three hundred twelve thousand, seven hundred forty-three".