64401553 has 2 divisors, whose sum is σ = 64401554. Its totient is φ = 64401552.

The previous prime is 64401551. The next prime is 64401563. The reversal of 64401553 is 35510446.

64401553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49168144 + 15233409 = 7012^2 + 3903^2 .

It is a cyclic number.

It is not a de Polignac number, because 64401553 - 2¹ = 64401551 is a prime.

Together with 64401551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64401551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200776 + 32200777.

It is an arithmetic number, because the mean of its divisors is an integer number (32200777).

Almost surely, 2^64401553 is an apocalyptic number.

It is an amenable number.

64401553 is a deficient number, since it is larger than the sum of its proper divisors (1).

64401553 is an equidigital number, since it uses as much as digits as its factorization.

64401553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 64401553 is about 8025.0578191064. The cubic root of 64401553 is about 400.8348252051.

Adding to 64401553 its reverse (35510446), we get a palindrome (99911999).

The spelling of 64401553 in words is "sixty-four million, four hundred one thousand, five hundred fifty-three".