63421693513939 has 2 divisors, whose sum is σ = 63421693513940. Its totient is φ = 63421693513938.

The previous prime is 63421693513909. The next prime is 63421693513961. The reversal of 63421693513939 is 93931539612436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63421693513939 - 2²⁹ = 63421156643027 is a prime.

It is a super-2 number, since 2×63421693513939² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63421693513909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31710846756969 + 31710846756970.

It is an arithmetic number, because the mean of its divisors is an integer number (31710846756970).

Almost surely, 2^{63421693513939} is an apocalyptic number.

63421693513939 is a deficient number, since it is larger than the sum of its proper divisors (1).

63421693513939 is an equidigital number, since it uses as much as digits as its factorization.

63421693513939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85030560, while the sum is 64.

The spelling of 63421693513939 in words is "sixty-three trillion, four hundred twenty-one billion, six hundred ninety-three million, five hundred thirteen thousand, nine hundred thirty-nine".