205555870425 has 24 divisors (see below), whose sum is σ = 339867309600. Its totient is φ = 109624979200.

The previous prime is 205555870423. The next prime is 205555870451. The reversal of 205555870425 is 524078555502.

It is a happy number.

It is not a de Polignac number, because 205555870425 - 2¹ = 205555870423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205555870423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2238670 + ... + 2328680.

It is an arithmetic number, because the mean of its divisors is an integer number (14161137900).

Almost surely, 2^205555870425 is an apocalyptic number.

205555870425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205555870425 is a deficient number, since it is larger than the sum of its proper divisors (134311439175).

205555870425 is a wasteful number, since it uses less digits than its factorization.

205555870425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120473 (or 120468 counting only the distinct ones).

The product of its (nonzero) digits is 2800000, while the sum is 48.

The spelling of 205555870425 in words is "two hundred five billion, five hundred fifty-five million, eight hundred seventy thousand, four hundred twenty-five".