661111225675 has 12 divisors (see below), whose sum is σ = 821603719800. Its totient is φ = 527711045120.

The previous prime is 661111225603. The next prime is 661111225679. The reversal of 661111225675 is 576522111166.

It is a happy number.

It is not a de Polignac number, because 661111225675 - 2⁹ = 661111225163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661111225679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29436937 + ... + 29459386.

It is an arithmetic number, because the mean of its divisors is an integer number (68466976650).

Almost surely, 2^661111225675 is an apocalyptic number.

661111225675 is a deficient number, since it is larger than the sum of its proper divisors (160492494125).

661111225675 is a wasteful number, since it uses less digits than its factorization.

661111225675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58896782 (or 58896777 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The spelling of 661111225675 in words is "six hundred sixty-one billion, one hundred eleven million, two hundred twenty-five thousand, six hundred seventy-five".