123625665 has 12 divisors (see below), whose sum is σ = 214284564. Its totient is φ = 65933664.

The previous prime is 123625661. The next prime is 123625679. The reversal of 123625665 is 566526321.

It is a happy number.

123625665 is a `hidden beast` number, since 1 + 23 + 625 + 6 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28387584 + 95238081 = 5328^2 + 9759^2 .

It is not a de Polignac number, because 123625665 - 2² = 123625661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123625661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1373574 + ... + 1373663.

It is an arithmetic number, because the mean of its divisors is an integer number (17857047).

Almost surely, 2^123625665 is an apocalyptic number.

123625665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123625665 is a deficient number, since it is larger than the sum of its proper divisors (90658899).

123625665 is a wasteful number, since it uses less digits than its factorization.

123625665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747248 (or 2747245 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 123625665 is about 11118.7078835627. The cubic root of 123625665 is about 498.1607962880.

It can be divided in two parts, 1236256 and 65, that added together give a palindrome (1236321).

The spelling of 123625665 in words is "one hundred twenty-three million, six hundred twenty-five thousand, six hundred sixty-five".