124641665 has 4 divisors (see below), whose sum is σ = 149570004. Its totient is φ = 99713328.

The previous prime is 124641661. The next prime is 124641683. The reversal of 124641665 is 566146421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566146421 = 2153 ⋅262957.

It can be written as a sum of positive squares in 2 ways, for example, as 37797904 + 86843761 = 6148^2 + 9319^2 .

It is a cyclic number.

It is not a de Polignac number, because 124641665 - 2² = 124641661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124641661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12464162 + ... + 12464171.

It is an arithmetic number, because the mean of its divisors is an integer number (37392501).

Almost surely, 2^124641665 is an apocalyptic number.

It is an amenable number.

124641665 is a deficient number, since it is larger than the sum of its proper divisors (24928339).

124641665 is an equidigital number, since it uses as much as digits as its factorization.

124641665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24928338.

The product of its digits is 34560, while the sum is 35.

The square root of 124641665 is about 11164.3031578330. The cubic root of 124641665 is about 499.5217627241.

The spelling of 124641665 in words is "one hundred twenty-four million, six hundred forty-one thousand, six hundred sixty-five".