64973761 has 2 divisors, whose sum is σ = 64973762. Its totient is φ = 64973760.

The previous prime is 64973759. The next prime is 64973767. The reversal of 64973761 is 16737946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45481536 + 19492225 = 6744^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 64973761 - 2¹ = 64973759 is a prime.

Together with 64973759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64973767) 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, 32486880 + 32486881.

It is an arithmetic number, because the mean of its divisors is an integer number (32486881).

Almost surely, 2^64973761 is an apocalyptic number.

It is an amenable number.

64973761 is a deficient number, since it is larger than the sum of its proper divisors (1).

64973761 is an equidigital number, since it uses as much as digits as its factorization.

64973761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 43.

The square root of 64973761 is about 8060.6303103417. The cubic root of 64973761 is about 402.0184661039.

The spelling of 64973761 in words is "sixty-four million, nine hundred seventy-three thousand, seven hundred sixty-one".