205446151643 has 4 divisors (see below), whose sum is σ = 206343296640. Its totient is φ = 204549006648.

The previous prime is 205446151633. The next prime is 205446151679. The reversal of 205446151643 is 346151644502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205446151643 - 2¹⁴ = 205446135259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205446151643.

It is not an unprimeable number, because it can be changed into a prime (205446151633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448572155 + ... + 448572612.

It is an arithmetic number, because the mean of its divisors is an integer number (51585824160).

Almost surely, 2^205446151643 is an apocalyptic number.

205446151643 is a deficient number, since it is larger than the sum of its proper divisors (897144997).

205446151643 is an equidigital number, since it uses as much as digits as its factorization.

205446151643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897144996.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 205446151643 in words is "two hundred five billion, four hundred forty-six million, one hundred fifty-one thousand, six hundred forty-three".