63694464221 has 2 divisors, whose sum is σ = 63694464222. Its totient is φ = 63694464220.

The previous prime is 63694464209. The next prime is 63694464307. The reversal of 63694464221 is 12246449636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39148975321 + 24545488900 = 197861^2 + 156670^2 .

It is a cyclic number.

It is not a de Polignac number, because 63694464221 - 2³⁰ = 62620722397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63694424221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31847232110 + 31847232111.

It is an arithmetic number, because the mean of its divisors is an integer number (31847232111).

Almost surely, 2^63694464221 is an apocalyptic number.

It is an amenable number.

63694464221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63694464221 is an equidigital number, since it uses as much as digits as its factorization.

63694464221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 47.

The spelling of 63694464221 in words is "sixty-three billion, six hundred ninety-four million, four hundred sixty-four thousand, two hundred twenty-one".