205401021512545 has 8 divisors (see below), whose sum is σ = 246481403629824. Its totient is φ = 164320698666864.

The previous prime is 205401021512513. The next prime is 205401021512591. The reversal of 205401021512545 is 545215120104502.

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 205401021512545 - 2⁵ = 205401021512513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6799519 + ... + 21378388.

It is an arithmetic number, because the mean of its divisors is an integer number (30810175453728).

Almost surely, 2^{205401021512545} is an apocalyptic number.

It is an amenable number.

205401021512545 is a deficient number, since it is larger than the sum of its proper divisors (41080382117279).

205401021512545 is a wasteful number, since it uses less digits than its factorization.

205401021512545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29635799.

The product of its (nonzero) digits is 80000, while the sum is 37.

The spelling of 205401021512545 in words is "two hundred five trillion, four hundred one billion, twenty-one million, five hundred twelve thousand, five hundred forty-five".