64557271 has 2 divisors, whose sum is σ = 64557272. Its totient is φ = 64557270.

The previous prime is 64557263. The next prime is 64557287. The reversal of 64557271 is 17275546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64557271 - 2³ = 64557263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64557271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64557071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32278635 + 32278636.

It is an arithmetic number, because the mean of its divisors is an integer number (32278636).

Almost surely, 2^64557271 is an apocalyptic number.

64557271 is a deficient number, since it is larger than the sum of its proper divisors (1).

64557271 is an equidigital number, since it uses as much as digits as its factorization.

64557271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 37.

The square root of 64557271 is about 8034.7539476950. The cubic root of 64557271 is about 401.1576277629.

The spelling of 64557271 in words is "sixty-four million, five hundred fifty-seven thousand, two hundred seventy-one".