205145753540 has 96 divisors (see below), whose sum is σ = 538915340544. Its totient is φ = 63860866560.

The previous prime is 205145753467. The next prime is 205145753551. The reversal of 205145753540 is 45357541502.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 812894 + ... + 1034933.

It is an arithmetic number, because the mean of its divisors is an integer number (5613701464).

Almost surely, 2^205145753540 is an apocalyptic number.

205145753540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205145753540 is an abundant number, since it is smaller than the sum of its proper divisors (333769587004).

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

205145753540 is a wasteful number, since it uses less digits than its factorization.

205145753540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847917 (or 1847915 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 41.

The spelling of 205145753540 in words is "two hundred five billion, one hundred forty-five million, seven hundred fifty-three thousand, five hundred forty".