205001615540 has 36 divisors (see below), whose sum is σ = 444838614948. Its totient is φ = 79355456640.

The previous prime is 205001615531. The next prime is 205001615593. The reversal of 205001615540 is 45516100502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 34549887376 + 170451728164 = 185876^2 + 412858^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5313809 + ... + 5352248.

It is an arithmetic number, because the mean of its divisors is an integer number (12356628193).

Almost surely, 2^205001615540 is an apocalyptic number.

205001615540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205001615540 is an abundant number, since it is smaller than the sum of its proper divisors (239836999408).

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

205001615540 is a wasteful number, since it uses less digits than its factorization.

205001615540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10666128 (or 10666095 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 205001615540 in words is "two hundred five billion, one million, six hundred fifteen thousand, five hundred forty".