64855649 has 2 divisors, whose sum is σ = 64855650. Its totient is φ = 64855648.

The previous prime is 64855633. The next prime is 64855667. The reversal of 64855649 is 94655846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49801249 + 15054400 = 7057^2 + 3880^2 .

It is a cyclic number.

It is not a de Polignac number, because 64855649 - 2⁴ = 64855633 is a prime.

It is a super-2 number, since 2×64855649² = 8412510414422402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64855249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32427824 + 32427825.

It is an arithmetic number, because the mean of its divisors is an integer number (32427825).

Almost surely, 2^64855649 is an apocalyptic number.

It is an amenable number.

64855649 is a deficient number, since it is larger than the sum of its proper divisors (1).

64855649 is an equidigital number, since it uses as much as digits as its factorization.

64855649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 47.

The square root of 64855649 is about 8053.3005035203. The cubic root of 64855649 is about 401.7747163925.

The spelling of 64855649 in words is "sixty-four million, eight hundred fifty-five thousand, six hundred forty-nine".