63910701691 has 2 divisors, whose sum is σ = 63910701692. Its totient is φ = 63910701690.

The previous prime is 63910701689. The next prime is 63910701761. The reversal of 63910701691 is 19610701936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63910701691 - 2¹ = 63910701689 is a prime.

Together with 63910701689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63910701991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31955350845 + 31955350846.

It is an arithmetic number, because the mean of its divisors is an integer number (31955350846).

Almost surely, 2^63910701691 is an apocalyptic number.

63910701691 is a deficient number, since it is larger than the sum of its proper divisors (1).

63910701691 is an equidigital number, since it uses as much as digits as its factorization.

63910701691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 43.

The spelling of 63910701691 in words is "sixty-three billion, nine hundred ten million, seven hundred one thousand, six hundred ninety-one".