205100515542 has 24 divisors (see below), whose sum is σ = 444182183784. Its totient is φ = 63107850624.

The previous prime is 205100515507. The next prime is 205100515561. The reversal of 205100515542 is 245515001502.

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, 101133363 + ... + 101135390.

It is an arithmetic number, because the mean of its divisors is an integer number (18507590991).

Almost surely, 2^205100515542 is an apocalyptic number.

205100515542 is an abundant number, since it is smaller than the sum of its proper divisors (239081668242).

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

205100515542 is a wasteful number, since it uses less digits than its factorization.

205100515542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202268784 (or 202268771 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The spelling of 205100515542 in words is "two hundred five billion, one hundred million, five hundred fifteen thousand, five hundred forty-two".