64657573 has 2 divisors, whose sum is σ = 64657574. Its totient is φ = 64657572.

The previous prime is 64657553. The next prime is 64657597. The reversal of 64657573 is 37575646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56806369 + 7851204 = 7537^2 + 2802^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64657573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64657543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32328786 + 32328787.

It is an arithmetic number, because the mean of its divisors is an integer number (32328787).

Almost surely, 2^64657573 is an apocalyptic number.

It is an amenable number.

64657573 is a deficient number, since it is larger than the sum of its proper divisors (1).

64657573 is an equidigital number, since it uses as much as digits as its factorization.

64657573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 43.

The square root of 64657573 is about 8040.9932844146. The cubic root of 64657573 is about 401.3652784849.

The spelling of 64657573 in words is "sixty-four million, six hundred fifty-seven thousand, five hundred seventy-three".