64644742036201 has 2 divisors, whose sum is σ = 64644742036202. Its totient is φ = 64644742036200.

The previous prime is 64644742036183. The next prime is 64644742036207. The reversal of 64644742036201 is 10263024744646.

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., 55733466285225 + 8911275750976 = 7465485^2 + 2985176^2 .

It is a cyclic number.

It is not a de Polignac number, because 64644742036201 - 2⁵ = 64644742036169 is a prime.

It is a super-2 number, since 2×64644742036201² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64644742036207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322371018100 + 32322371018101.

It is an arithmetic number, because the mean of its divisors is an integer number (32322371018101).

Almost surely, 2^{64644742036201} is an apocalyptic number.

It is an amenable number.

64644742036201 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644742036201 is an equidigital number, since it uses as much as digits as its factorization.

64644742036201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 49.

The spelling of 64644742036201 in words is "sixty-four trillion, six hundred forty-four billion, seven hundred forty-two million, thirty-six thousand, two hundred one".