64780061 has 2 divisors, whose sum is σ = 64780062. Its totient is φ = 64780060.

The previous prime is 64780021. The next prime is 64780073. The reversal of 64780061 is 16008746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38514436 + 26265625 = 6206^2 + 5125^2 .

It is a cyclic number.

It is not a de Polignac number, because 64780061 - 2²² = 60585757 is a prime.

It is a Chen prime.

It is equal to p_3828317 and since 64780061 and 3828317 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64780021) 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 as a sum of consecutive naturals, namely, 32390030 + 32390031.

It is an arithmetic number, because the mean of its divisors is an integer number (32390031).

Almost surely, 2^64780061 is an apocalyptic number.

It is an amenable number.

64780061 is a deficient number, since it is larger than the sum of its proper divisors (1).

64780061 is an equidigital number, since it uses as much as digits as its factorization.

64780061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 64780061 is about 8048.6061526205. The cubic root of 64780061 is about 401.6185688367.

It can be divided in two parts, 647 and 80061, that added together give a palindrome (80708).

The spelling of 64780061 in words is "sixty-four million, seven hundred eighty thousand, sixty-one".