61668265 has 12 divisors (see below), whose sum is σ = 78612876. Its totient is φ = 46431488.

The previous prime is 61668251. The next prime is 61668287. The reversal of 61668265 is 56286616.

It can be written as a sum of positive squares in 6 ways, for example, as 4272489 + 57395776 = 2067^2 + 7576^2 .

It is not a de Polignac number, because 61668265 - 2¹⁷ = 61537193 is a prime.

It is a super-2 number, since 2×61668265² = 7605949816220450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 19894 + ... + 22783.

It is an arithmetic number, because the mean of its divisors is an integer number (6551073).

Almost surely, 2^61668265 is an apocalyptic number.

It is an amenable number.

61668265 is a deficient number, since it is larger than the sum of its proper divisors (16944611).

61668265 is a wasteful number, since it uses less digits than its factorization.

61668265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42716 (or 42699 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 61668265 is about 7852.9144271410. The cubic root of 61668265 is about 395.0819997470.

The spelling of 61668265 in words is "sixty-one million, six hundred sixty-eight thousand, two hundred sixty-five".