64637533 has 2 divisors, whose sum is σ = 64637534. Its totient is φ = 64637532.

The previous prime is 64637527. The next prime is 64637561. The reversal of 64637533 is 33573646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40411449 + 24226084 = 6357^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 64637533 - 2⁹ = 64637021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64637492 and 64637501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64637233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32318766 + 32318767.

It is an arithmetic number, because the mean of its divisors is an integer number (32318767).

Almost surely, 2^64637533 is an apocalyptic number.

It is an amenable number.

64637533 is a deficient number, since it is larger than the sum of its proper divisors (1).

64637533 is an equidigital number, since it uses as much as digits as its factorization.

64637533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 37.

The square root of 64637533 is about 8039.7470731361. The cubic root of 64637533 is about 401.3238077494.

The spelling of 64637533 in words is "sixty-four million, six hundred thirty-seven thousand, five hundred thirty-three".