63935942391 has 12 divisors (see below), whose sum is σ = 94847915032. Its totient is φ = 41471962416.

The previous prime is 63935942341. The next prime is 63935942393. The reversal of 63935942391 is 19324953936.

It is not a de Polignac number, because 63935942391 - 2¹⁰ = 63935941367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63935942393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95999581 + ... + 96000246.

Almost surely, 2^63935942391 is an apocalyptic number.

63935942391 is a deficient number, since it is larger than the sum of its proper divisors (30911972641).

63935942391 is a wasteful number, since it uses less digits than its factorization.

63935942391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191999870 (or 191999867 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 54.

The spelling of 63935942391 in words is "sixty-three billion, nine hundred thirty-five million, nine hundred forty-two thousand, three hundred ninety-one".