123025865661 has 16 divisors (see below), whose sum is σ = 182285689920. Its totient is φ = 82005927120.

The previous prime is 123025865647. The next prime is 123025865707. The reversal of 123025865661 is 166568520321.

123025865661 is a `hidden beast` number, since 1 + 2 + 3 + 0 + 2 + 5 + 86 + 566 + 1 = 666.

It is not a de Polignac number, because 123025865661 - 2⁶ = 123025865597 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123025865161) 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 15 ways as a sum of consecutive naturals, for example, 112695 + ... + 508676.

It is an arithmetic number, because the mean of its divisors is an integer number (11392855620).

Almost surely, 2^123025865661 is an apocalyptic number.

It is an amenable number.

123025865661 is a deficient number, since it is larger than the sum of its proper divisors (59259824259).

123025865661 is an equidigital number, since it uses as much as digits as its factorization.

123025865661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628713 (or 628707 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 123025865661 in words is "one hundred twenty-three billion, twenty-five million, eight hundred sixty-five thousand, six hundred sixty-one".