205402151113 has 4 divisors (see below), whose sum is σ = 212484983940. Its totient is φ = 198319318288.

The previous prime is 205402151039. The next prime is 205402151131. The reversal of 205402151113 is 311151204502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 151785822409 + 53616328704 = 389597^2 + 231552^2 .

It is a cyclic number.

It is not a de Polignac number, because 205402151113 - 2²¹ = 205400053961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205402151413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3541416370 + ... + 3541416427.

It is an arithmetic number, because the mean of its divisors is an integer number (53121245985).

Almost surely, 2^205402151113 is an apocalyptic number.

It is an amenable number.

205402151113 is a deficient number, since it is larger than the sum of its proper divisors (7082832827).

205402151113 is an equidigital number, since it uses as much as digits as its factorization.

205402151113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7082832826.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 205402151113 its reverse (311151204502), we get a palindrome (516553355615).

The spelling of 205402151113 in words is "two hundred five billion, four hundred two million, one hundred fifty-one thousand, one hundred thirteen".