64746581 has 2 divisors, whose sum is σ = 64746582. Its totient is φ = 64746580.

The previous prime is 64746551. The next prime is 64746599. The reversal of 64746581 is 18564746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45024100 + 19722481 = 6710^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 64746581 - 2¹⁰ = 64745557 is a prime.

It is a super-2 number, since 2×64746581² = 8384239502379122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64746511) 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, 32373290 + 32373291.

It is an arithmetic number, because the mean of its divisors is an integer number (32373291).

Almost surely, 2^64746581 is an apocalyptic number.

It is an amenable number.

64746581 is a deficient number, since it is larger than the sum of its proper divisors (1).

64746581 is an equidigital number, since it uses as much as digits as its factorization.

64746581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 41.

The square root of 64746581 is about 8046.5260205880. The cubic root of 64746581 is about 401.5493679819.

The spelling of 64746581 in words is "sixty-four million, seven hundred forty-six thousand, five hundred eighty-one".