61255665 has 24 divisors (see below), whose sum is σ = 106540200. Its totient is φ = 32557824.

The previous prime is 61255657. The next prime is 61255669. The reversal of 61255665 is 56655216.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7144929 + 54110736 = 2673^2 + 7356^2 .

It is not a de Polignac number, because 61255665 - 2³ = 61255657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61255669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11911 + ... + 16259.

It is an arithmetic number, because the mean of its divisors is an integer number (4439175).

Almost surely, 2^61255665 is an apocalyptic number.

It is an amenable number.

61255665 is a deficient number, since it is larger than the sum of its proper divisors (45284535).

61255665 is a wasteful number, since it uses less digits than its factorization.

61255665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673 (or 4670 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 61255665 is about 7826.5998364552. The cubic root of 61255665 is about 394.1989105316.

The spelling of 61255665 in words is "sixty-one million, two hundred fifty-five thousand, six hundred sixty-five".