61965643 has 2 divisors, whose sum is σ = 61965644. Its totient is φ = 61965642.

The previous prime is 61965641. The next prime is 61965647. The reversal of 61965643 is 34656916.

61965643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61965643 - 2¹ = 61965641 is a prime.

Together with 61965641, it forms a pair of twin primes.

It is equal to p_3671689 and since 61965643 and 3671689 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 61965596 and 61965605.

It is not a weakly prime, because it can be changed into another prime (61965641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30982821 + 30982822.

It is an arithmetic number, because the mean of its divisors is an integer number (30982822).

Almost surely, 2^61965643 is an apocalyptic number.

61965643 is a deficient number, since it is larger than the sum of its proper divisors (1).

61965643 is an equidigital number, since it uses as much as digits as its factorization.

61965643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 61965643 is about 7871.8259000057. The cubic root of 61965643 is about 395.7160392435.

The spelling of 61965643 in words is "sixty-one million, nine hundred sixty-five thousand, six hundred forty-three".