64415430421621 has 2 divisors, whose sum is σ = 64415430421622. Its totient is φ = 64415430421620.

The previous prime is 64415430421577. The next prime is 64415430421637. The reversal of 64415430421621 is 12612403451446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44621251047396 + 19794179374225 = 6679914^2 + 4449065^2 .

It is a cyclic number.

It is not a de Polignac number, because 64415430421621 - 2¹³ = 64415430413429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64415430421421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32207715210810 + 32207715210811.

It is an arithmetic number, because the mean of its divisors is an integer number (32207715210811).

Almost surely, 2^{64415430421621} is an apocalyptic number.

It is an amenable number.

64415430421621 is a deficient number, since it is larger than the sum of its proper divisors (1).

64415430421621 is an equidigital number, since it uses as much as digits as its factorization.

64415430421621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 64415430421621 in words is "sixty-four trillion, four hundred fifteen billion, four hundred thirty million, four hundred twenty-one thousand, six hundred twenty-one".