20161257425 has 12 divisors (see below), whose sum is σ = 25011767820. Its totient is φ = 16121387520.

The previous prime is 20161257421. The next prime is 20161257449. The reversal of 20161257425 is 52475216102.

It can be written as a sum of positive squares in 6 ways, for example, as 1472180161 + 18689077264 = 38369^2 + 136708^2 .

It is not a de Polignac number, because 20161257425 - 2² = 20161257421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20161257421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136172 + ... + 242621.

It is an arithmetic number, because the mean of its divisors is an integer number (2084313985).

Almost surely, 2^20161257425 is an apocalyptic number.

20161257425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20161257425 is a deficient number, since it is larger than the sum of its proper divisors (4850510395).

20161257425 is a wasteful number, since it uses less digits than its factorization.

20161257425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380932 (or 380927 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The spelling of 20161257425 in words is "twenty billion, one hundred sixty-one million, two hundred fifty-seven thousand, four hundred twenty-five".