64104640121 has 2 divisors, whose sum is σ = 64104640122. Its totient is φ = 64104640120.

The previous prime is 64104640109. The next prime is 64104640183. The reversal of 64104640121 is 12104640146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49088833600 + 15015806521 = 221560^2 + 122539^2 .

It is a cyclic number.

It is not a de Polignac number, because 64104640121 - 2¹⁸ = 64104377977 is a prime.

It is not a weakly prime, because it can be changed into another prime (64104640021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32052320060 + 32052320061.

It is an arithmetic number, because the mean of its divisors is an integer number (32052320061).

Almost surely, 2^64104640121 is an apocalyptic number.

It is an amenable number.

64104640121 is a deficient number, since it is larger than the sum of its proper divisors (1).

64104640121 is an equidigital number, since it uses as much as digits as its factorization.

64104640121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 64104640121 in words is "sixty-four billion, one hundred four million, six hundred forty thousand, one hundred twenty-one".