205521873980 has 24 divisors (see below), whose sum is σ = 432683095488. Its totient is φ = 82001671488.

The previous prime is 205521873979. The next prime is 205521874009. The reversal of 205521873980 is 89378125502.

It is a happy number.

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, 12934244 + ... + 12950123.

It is an arithmetic number, because the mean of its divisors is an integer number (18028462312).

Almost surely, 2^205521873980 is an apocalyptic number.

205521873980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205521873980 is an abundant number, since it is smaller than the sum of its proper divisors (227161221508).

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

205521873980 is a wasteful number, since it uses less digits than its factorization.

205521873980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25884773 (or 25884771 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 205521873980 in words is "two hundred five billion, five hundred twenty-one million, eight hundred seventy-three thousand, nine hundred eighty".