64401641 has 2 divisors, whose sum is σ = 64401642. Its totient is φ = 64401640.

The previous prime is 64401637. The next prime is 64401643. The reversal of 64401641 is 14610446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32535616 + 31866025 = 5704^2 + 5645^2 .

It is a cyclic number.

It is not a de Polignac number, because 64401641 - 2² = 64401637 is a prime.

Together with 64401643, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64401641.

It is not a weakly prime, because it can be changed into another prime (64401643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200820 + 32200821.

It is an arithmetic number, because the mean of its divisors is an integer number (32200821).

Almost surely, 2^64401641 is an apocalyptic number.

It is an amenable number.

64401641 is a deficient number, since it is larger than the sum of its proper divisors (1).

64401641 is an equidigital number, since it uses as much as digits as its factorization.

64401641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 64401641 is about 8025.0633019310. The cubic root of 64401641 is about 400.8350077755.

The spelling of 64401641 in words is "sixty-four million, four hundred one thousand, six hundred forty-one".