205350449370 has 64 divisors (see below), whose sum is σ = 538199354880. Its totient is φ = 49730580800.

The previous prime is 205350449363. The next prime is 205350449371. The reversal of 205350449370 is 73944053502.

205350449370 is a nontrivial binomial coefficient, being equal to C(640860, 2).

It is not an unprimeable number, because it can be changed into a prime (205350449371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1 + ... + 640859.

It is an arithmetic number, because the mean of its divisors is an integer number (8409364920).

Almost surely, 2^205350449370 is an apocalyptic number.

205350449370 is the 640859-th triangular number and also the 320430-th hexagonal number.

205350449370 is an abundant number, since it is smaller than the sum of its proper divisors (332848905510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205350449370 is a wasteful number, since it uses less digits than its factorization.

205350449370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641851.

The product of its (nonzero) digits is 453600, while the sum is 42.

It can be divided in two parts, 205 and 350449370, that added together give a triangular number (350449575 = T₂₆₄₇₄).

The spelling of 205350449370 in words is "two hundred five billion, three hundred fifty million, four hundred forty-nine thousand, three hundred seventy".