205154325115 has 4 divisors (see below), whose sum is σ = 246185190144. Its totient is φ = 164123460088.

The previous prime is 205154325091. The next prime is 205154325137. The reversal of 205154325115 is 511523451502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205154325115 - 2³⁵ = 170794586747 is a prime.

It is a super-2 number, since 2×205154325115² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20515432507 + ... + 20515432516.

It is an arithmetic number, because the mean of its divisors is an integer number (61546297536).

Almost surely, 2^205154325115 is an apocalyptic number.

205154325115 is a deficient number, since it is larger than the sum of its proper divisors (41030865029).

205154325115 is an equidigital number, since it uses as much as digits as its factorization.

205154325115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41030865028.

The product of its (nonzero) digits is 30000, while the sum is 34.

Adding to 205154325115 its reverse (511523451502), we get a palindrome (716677776617).

The spelling of 205154325115 in words is "two hundred five billion, one hundred fifty-four million, three hundred twenty-five thousand, one hundred fifteen".