64641617 has 2 divisors, whose sum is σ = 64641618. Its totient is φ = 64641616.

The previous prime is 64641611. The next prime is 64641641. The reversal of 64641617 is 71614646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62980096 + 1661521 = 7936^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 64641617 - 2¹⁰ = 64640593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64641611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32320808 + 32320809.

It is an arithmetic number, because the mean of its divisors is an integer number (32320809).

Almost surely, 2^64641617 is an apocalyptic number.

It is an amenable number.

64641617 is a deficient number, since it is larger than the sum of its proper divisors (1).

64641617 is an equidigital number, since it uses as much as digits as its factorization.

64641617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 64641617 is about 8040.0010572139. The cubic root of 64641617 is about 401.3322598661.

The spelling of 64641617 in words is "sixty-four million, six hundred forty-one thousand, six hundred seventeen".