205440556423 has 8 divisors (see below), whose sum is σ = 208063175760. Its totient is φ = 202831352640.

The previous prime is 205440556417. The next prime is 205440556459. The reversal of 205440556423 is 324655044502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205440556423 - 2³⁷ = 68001602951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205440556483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3323065 + ... + 3384322.

It is an arithmetic number, because the mean of its divisors is an integer number (26007896970).

Almost surely, 2^205440556423 is an apocalyptic number.

205440556423 is a deficient number, since it is larger than the sum of its proper divisors (2622619337).

205440556423 is a wasteful number, since it uses less digits than its factorization.

205440556423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707777.

The product of its (nonzero) digits is 576000, while the sum is 40.

The spelling of 205440556423 in words is "two hundred five billion, four hundred forty million, five hundred fifty-six thousand, four hundred twenty-three".