64618861 has 2 divisors, whose sum is σ = 64618862. Its totient is φ = 64618860.

The previous prime is 64618847. The next prime is 64618877. The reversal of 64618861 is 16881646.

64618861 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 can be written as a sum of positive squares in only one way, i.e., 61622500 + 2996361 = 7850^2 + 1731^2 .

It is a cyclic number.

It is not a de Polignac number, because 64618861 - 2¹³ = 64610669 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64618811) 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, 32309430 + 32309431.

It is an arithmetic number, because the mean of its divisors is an integer number (32309431).

Almost surely, 2^64618861 is an apocalyptic number.

It is an amenable number.

64618861 is a deficient number, since it is larger than the sum of its proper divisors (1).

64618861 is an equidigital number, since it uses as much as digits as its factorization.

64618861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 64618861 is about 8038.5857587016. The cubic root of 64618861 is about 401.2851602358.

The spelling of 64618861 in words is "sixty-four million, six hundred eighteen thousand, eight hundred sixty-one".