64419988691 has 2 divisors, whose sum is σ = 64419988692. Its totient is φ = 64419988690.

The previous prime is 64419988687. The next prime is 64419988693. The reversal of 64419988691 is 19688991446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64419988691 - 2² = 64419988687 is a prime.

Together with 64419988693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64419988693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32209994345 + 32209994346.

It is an arithmetic number, because the mean of its divisors is an integer number (32209994346).

Almost surely, 2^64419988691 is an apocalyptic number.

64419988691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64419988691 is an equidigital number, since it uses as much as digits as its factorization.

64419988691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 65.

The spelling of 64419988691 in words is "sixty-four billion, four hundred nineteen million, nine hundred eighty-eight thousand, six hundred ninety-one".