205214378590 has 16 divisors (see below), whose sum is σ = 397800180288. Its totient is φ = 75771462816.

The previous prime is 205214378581. The next prime is 205214378617. The reversal of 205214378590 is 95873412502.

It is a super-2 number, since 2×205214378590² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205214378590.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789285942 + ... + 789286201.

It is an arithmetic number, because the mean of its divisors is an integer number (24862511268).

Almost surely, 2^205214378590 is an apocalyptic number.

205214378590 is a deficient number, since it is larger than the sum of its proper divisors (192585801698).

205214378590 is a wasteful number, since it uses less digits than its factorization.

205214378590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578572163.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 205214378590 in words is "two hundred five billion, two hundred fourteen million, three hundred seventy-eight thousand, five hundred ninety".