205205115007 has 4 divisors (see below), whose sum is σ = 205296279016. Its totient is φ = 205113951000.

The previous prime is 205205114981. The next prime is 205205115107. The reversal of 205205115007 is 700511502502.

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 205205115007 - 2¹⁵ = 205205082239 is a prime.

It is a super-2 number, since 2×205205115007² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205205115107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45578628 + ... + 45583129.

It is an arithmetic number, because the mean of its divisors is an integer number (51324069754).

Almost surely, 2^205205115007 is an apocalyptic number.

205205115007 is a deficient number, since it is larger than the sum of its proper divisors (91164009).

205205115007 is an equidigital number, since it uses as much as digits as its factorization.

205205115007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91164008.

The product of its (nonzero) digits is 3500, while the sum is 28.

Adding to 205205115007 its reverse (700511502502), we get a palindrome (905716617509).

The spelling of 205205115007 in words is "two hundred five billion, two hundred five million, one hundred fifteen thousand, seven".