61668243 has 64 divisors (see below), whose sum is σ = 118451200. Its totient is φ = 30792960.

The previous prime is 61668241. The next prime is 61668251. The reversal of 61668243 is 34286616.

It is not a de Polignac number, because 61668243 - 2¹ = 61668241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61668198 and 61668207.

It is not an unprimeable number, because it can be changed into a prime (61668241) 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 63 ways as a sum of consecutive naturals, for example, 46023 + ... + 47343.

It is an arithmetic number, because the mean of its divisors is an integer number (1850800).

Almost surely, 2^61668243 is an apocalyptic number.

61668243 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

61668243 is a deficient number, since it is larger than the sum of its proper divisors (56782957).

61668243 is a wasteful number, since it uses less digits than its factorization.

61668243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369 (or 1363 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 61668243 is about 7852.9130263871. The cubic root of 61668243 is about 395.0819527654.

The spelling of 61668243 in words is "sixty-one million, six hundred sixty-eight thousand, two hundred forty-three".