63421693513909 has 2 divisors, whose sum is σ = 63421693513910. Its totient is φ = 63421693513908.

The previous prime is 63421693513877. The next prime is 63421693513939. The reversal of 63421693513909 is 90931539612436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60579805589809 + 2841887924100 = 7783303^2 + 1685790^2 .

It is a cyclic number.

It is not a de Polignac number, because 63421693513909 - 2⁵ = 63421693513877 is a prime.

It is a super-2 number, since 2×63421693513909² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63421693513939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31710846756954 + 31710846756955.

It is an arithmetic number, because the mean of its divisors is an integer number (31710846756955).

Almost surely, 2^{63421693513909} is an apocalyptic number.

It is an amenable number.

63421693513909 is a deficient number, since it is larger than the sum of its proper divisors (1).

63421693513909 is an equidigital number, since it uses as much as digits as its factorization.

63421693513909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28343520, while the sum is 61.

The spelling of 63421693513909 in words is "sixty-three trillion, four hundred twenty-one billion, six hundred ninety-three million, five hundred thirteen thousand, nine hundred nine".