63779136991 has 4 divisors (see below), whose sum is σ = 63780474184. Its totient is φ = 63777799800.

The previous prime is 63779136989. The next prime is 63779137039. The reversal of 63779136991 is 19963197736.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63779136991 - 2¹ = 63779136989 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 (63779136961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594300 + ... + 693361.

It is an arithmetic number, because the mean of its divisors is an integer number (15945118546).

Almost surely, 2^63779136991 is an apocalyptic number.

63779136991 is a deficient number, since it is larger than the sum of its proper divisors (1337193).

63779136991 is a wasteful number, since it uses less digits than its factorization.

63779136991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337192.

The product of its digits is 11573604, while the sum is 61.

The spelling of 63779136991 in words is "sixty-three billion, seven hundred seventy-nine million, one hundred thirty-six thousand, nine hundred ninety-one".