61807643 has 2 divisors, whose sum is σ = 61807644. Its totient is φ = 61807642.

The previous prime is 61807621. The next prime is 61807667. The reversal of 61807643 is 34670816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61807643 - 2⁸ = 61807387 is a prime.

It is not a weakly prime, because it can be changed into another prime (61807673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30903821 + 30903822.

It is an arithmetic number, because the mean of its divisors is an integer number (30903822).

Almost surely, 2^61807643 is an apocalyptic number.

61807643 is a deficient number, since it is larger than the sum of its proper divisors (1).

61807643 is an equidigital number, since it uses as much as digits as its factorization.

61807643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 61807643 is about 7861.7837034607. The cubic root of 61807643 is about 395.3794207182.

The spelling of 61807643 in words is "sixty-one million, eight hundred seven thousand, six hundred forty-three".