205151952138 has 16 divisors (see below), whose sum is σ = 468918747840. Its totient is φ = 58614843456.

The previous prime is 205151952127. The next prime is 205151952143. The reversal of 205151952138 is 831259151502.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 4884570289 = 205151952138 / (2 + 0 + 5 + 1 + 5 + 1 + 9 + 5 + 2 + 1 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 205151952138.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2442285103 + ... + 2442285186.

It is an arithmetic number, because the mean of its divisors is an integer number (29307421740).

Almost surely, 2^205151952138 is an apocalyptic number.

205151952138 is an abundant number, since it is smaller than the sum of its proper divisors (263766795702).

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

205151952138 is a wasteful number, since it uses less digits than its factorization.

205151952138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884570301.

The product of its (nonzero) digits is 108000, while the sum is 42.

The spelling of 205151952138 in words is "two hundred five billion, one hundred fifty-one million, nine hundred fifty-two thousand, one hundred thirty-eight".