205102404425 has 12 divisors (see below), whose sum is σ = 254416715916. Its totient is φ = 164024030400.

The previous prime is 205102404421. The next prime is 205102404443. The reversal of 205102404425 is 524404201502.

It can be written as a sum of positive squares in 6 ways, for example, as 5219195536 + 199883208889 = 72244^2 + 447083^2 .

It is not a de Polignac number, because 205102404425 - 2² = 205102404421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205102404421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1374986 + ... + 1516835.

It is an arithmetic number, because the mean of its divisors is an integer number (21201392993).

Almost surely, 2^205102404425 is an apocalyptic number.

205102404425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205102404425 is a deficient number, since it is larger than the sum of its proper divisors (49314311491).

205102404425 is a wasteful number, since it uses less digits than its factorization.

205102404425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894668 (or 2894663 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 205102404425 its reverse (524404201502), we get a palindrome (729506605927).

The spelling of 205102404425 in words is "two hundred five billion, one hundred two million, four hundred four thousand, four hundred twenty-five".