8125635561 has 16 divisors (see below), whose sum is σ = 11100105984. Its totient is φ = 5284865664.

The previous prime is 8125635517. The next prime is 8125635577. The reversal of 8125635561 is 1655365218.

It is a happy number.

It is not a de Polignac number, because 8125635561 - 2¹¹ = 8125633513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8125635761) 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 15 ways as a sum of consecutive naturals, for example, 47926 + ... + 136191.

It is an arithmetic number, because the mean of its divisors is an integer number (693756624).

Almost surely, 2^8125635561 is an apocalyptic number.

It is an amenable number.

8125635561 is a deficient number, since it is larger than the sum of its proper divisors (2974470423).

8125635561 is a wasteful number, since it uses less digits than its factorization.

8125635561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184480.

The product of its digits is 216000, while the sum is 42.

The square root of 8125635561 is about 90142.3072757737. The cubic root of 8125635561 is about 2010.4152967275.

The spelling of 8125635561 in words is "eight billion, one hundred twenty-five million, six hundred thirty-five thousand, five hundred sixty-one".