64681013633 has 2 divisors, whose sum is σ = 64681013634. Its totient is φ = 64681013632.

The previous prime is 64681013629. The next prime is 64681013651. The reversal of 64681013633 is 33631018646.

64681013633 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., 55378796929 + 9302216704 = 235327^2 + 96448^2 .

It is a cyclic number.

It is not a de Polignac number, because 64681013633 - 2² = 64681013629 is a prime.

It is not a weakly prime, because it can be changed into another prime (64681013623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32340506816 + 32340506817.

It is an arithmetic number, because the mean of its divisors is an integer number (32340506817).

Almost surely, 2^64681013633 is an apocalyptic number.

It is an amenable number.

64681013633 is a deficient number, since it is larger than the sum of its proper divisors (1).

64681013633 is an equidigital number, since it uses as much as digits as its factorization.

64681013633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 64681013633 in words is "sixty-four billion, six hundred eighty-one million, thirteen thousand, six hundred thirty-three".