64719917 has 2 divisors, whose sum is σ = 64719918. Its totient is φ = 64719916.

The previous prime is 64719911. The next prime is 64719931. The reversal of 64719917 is 71991746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62948356 + 1771561 = 7934^2 + 1331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64719917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64719911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32359958 + 32359959.

It is an arithmetic number, because the mean of its divisors is an integer number (32359959).

Almost surely, 2^64719917 is an apocalyptic number.

It is an amenable number.

64719917 is a deficient number, since it is larger than the sum of its proper divisors (1).

64719917 is an equidigital number, since it uses as much as digits as its factorization.

64719917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 44.

The square root of 64719917 is about 8044.8689858816. The cubic root of 64719917 is about 401.4942382628.

The spelling of 64719917 in words is "sixty-four million, seven hundred nineteen thousand, nine hundred seventeen".