205131571242 has 32 divisors (see below), whose sum is σ = 441843968832. Its totient is φ = 63114246144.

The previous prime is 205131571231. The next prime is 205131571273. The reversal of 205131571242 is 242175131502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1861098 + ... + 1968234.

It is an arithmetic number, because the mean of its divisors is an integer number (13807624026).

Almost surely, 2^205131571242 is an apocalyptic number.

205131571242 is an abundant number, since it is smaller than the sum of its proper divisors (236712397590).

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

205131571242 is a wasteful number, since it uses less digits than its factorization.

205131571242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131702.

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 205131571242 in words is "two hundred five billion, one hundred thirty-one million, five hundred seventy-one thousand, two hundred forty-two".