64446780401 has 2 divisors, whose sum is σ = 64446780402. Its totient is φ = 64446780400.

The previous prime is 64446780373. The next prime is 64446780427. The reversal of 64446780401 is 10408764446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34560669025 + 29886111376 = 185905^2 + 172876^2 .

It is a cyclic number.

It is not a de Polignac number, because 64446780401 - 2²² = 64442586097 is a prime.

It is not a weakly prime, because it can be changed into another prime (64446780001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32223390200 + 32223390201.

It is an arithmetic number, because the mean of its divisors is an integer number (32223390201).

Almost surely, 2^64446780401 is an apocalyptic number.

It is an amenable number.

64446780401 is a deficient number, since it is larger than the sum of its proper divisors (1).

64446780401 is an equidigital number, since it uses as much as digits as its factorization.

64446780401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 44.

The spelling of 64446780401 in words is "sixty-four billion, four hundred forty-six million, seven hundred eighty thousand, four hundred one".