61668641 has 8 divisors (see below), whose sum is σ = 63857664. Its totient is φ = 59492160.

The previous prime is 61668637. The next prime is 61668647. The reversal of 61668641 is 14686616.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61668641 - 2² = 61668637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61668595 and 61668604.

It is not an unprimeable number, because it can be changed into a prime (61668647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7496 + ... + 13398.

It is an arithmetic number, because the mean of its divisors is an integer number (7982208).

Almost surely, 2^61668641 is an apocalyptic number.

It is an amenable number.

61668641 is a deficient number, since it is larger than the sum of its proper divisors (2189023).

61668641 is a wasteful number, since it uses less digits than its factorization.

61668641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6271.

The product of its digits is 41472, while the sum is 38.

The square root of 61668641 is about 7852.9383672610. The cubic root of 61668641 is about 395.0828027020.

The spelling of 61668641 in words is "sixty-one million, six hundred sixty-eight thousand, six hundred forty-one".