205287197880 has 32 divisors (see below), whose sum is σ = 615861594000. Its totient is φ = 54743252736.

The previous prime is 205287197879. The next prime is 205287197893. The reversal of 205287197880 is 88791782502.

It is a super-2 number, since 2×205287197880² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 205287197880.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855363205 + ... + 855363444.

Almost surely, 2^205287197880 is an apocalyptic number.

205287197880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205287197880 is an abundant number, since it is smaller than the sum of its proper divisors (410574396120).

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

205287197880 is a wasteful number, since it uses less digits than its factorization.

205287197880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710726663 (or 1710726659 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 57.

The spelling of 205287197880 in words is "two hundred five billion, two hundred eighty-seven million, one hundred ninety-seven thousand, eight hundred eighty".