64645457 has 2 divisors, whose sum is σ = 64645458. Its totient is φ = 64645456.

The previous prime is 64645307. The next prime is 64645459. The reversal of 64645457 is 75454646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51036736 + 13608721 = 7144^2 + 3689^2 .

It is a cyclic number.

It is not a de Polignac number, because 64645457 - 2¹⁸ = 64383313 is a prime.

It is a super-2 number, since 2×64645457² = 8358070221477698, which contains 22 as substring.

Together with 64645459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64645459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322728 + 32322729.

It is an arithmetic number, because the mean of its divisors is an integer number (32322729).

Almost surely, 2^64645457 is an apocalyptic number.

It is an amenable number.

64645457 is a deficient number, since it is larger than the sum of its proper divisors (1).

64645457 is an equidigital number, since it uses as much as digits as its factorization.

64645457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 41.

The square root of 64645457 is about 8040.2398596062. The cubic root of 64645457 is about 401.3402066834.

The spelling of 64645457 in words is "sixty-four million, six hundred forty-five thousand, four hundred fifty-seven".