205128025715730 has 128 divisors (see below), whose sum is σ = 546250242746880. Its totient is φ = 48984950568960.

The previous prime is 205128025715729. The next prime is 205128025715737. The reversal of 205128025715730 is 37517520821502.

It is a super-4 number, since 4×205128025715730⁴ (a number of 58 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205128025715730.

It is not an unprimeable number, because it can be changed into a prime (205128025715737) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57321190 + ... + 60794529.

It is an arithmetic number, because the mean of its divisors is an integer number (4267580021460).

Almost surely, 2^{205128025715730} is an apocalyptic number.

205128025715730 is an abundant number, since it is smaller than the sum of its proper divisors (341122217031150).

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

205128025715730 is a wasteful number, since it uses less digits than its factorization.

205128025715730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118115876.

The product of its (nonzero) digits is 1176000, while the sum is 48.

The spelling of 205128025715730 in words is "two hundred five trillion, one hundred twenty-eight billion, twenty-five million, seven hundred fifteen thousand, seven hundred thirty".