205435478644 has 48 divisors (see below), whose sum is σ = 404912793600. Its totient is φ = 90352706400.

The previous prime is 205435478597. The next prime is 205435478669. The reversal of 205435478644 is 446874534502.

It is a junction number, because it is equal to n+sod(n) for n = 205435478591 and 205435478600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15077667 + ... + 15091285.

It is an arithmetic number, because the mean of its divisors is an integer number (8435683200).

Almost surely, 2^205435478644 is an apocalyptic number.

It is an amenable number.

205435478644 is a deficient number, since it is larger than the sum of its proper divisors (199477314956).

205435478644 is a wasteful number, since it uses less digits than its factorization.

205435478644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24724 (or 24722 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 52.

The spelling of 205435478644 in words is "two hundred five billion, four hundred thirty-five million, four hundred seventy-eight thousand, six hundred forty-four".